+++ /dev/null
-/* sun4c.c: Doing in software what should be done in hardware.
- *
- * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
- * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
- * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
- * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
- * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
-
-#define NR_TASK_BUCKETS 512
-
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/bootmem.h>
-#include <linux/highmem.h>
-#include <linux/fs.h>
-#include <linux/seq_file.h>
-#include <linux/scatterlist.h>
-#include <linux/bitmap.h>
-
-#include <asm/sections.h>
-#include <asm/page.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
-#include <asm/vaddrs.h>
-#include <asm/idprom.h>
-#include <asm/machines.h>
-#include <asm/memreg.h>
-#include <asm/processor.h>
-#include <asm/auxio.h>
-#include <asm/io.h>
-#include <asm/oplib.h>
-#include <asm/openprom.h>
-#include <asm/mmu_context.h>
-#include <asm/highmem.h>
-#include <asm/btfixup.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-
-/* Because of our dynamic kernel TLB miss strategy, and how
- * our DVMA mapping allocation works, you _MUST_:
- *
- * 1) Disable interrupts _and_ not touch any dynamic kernel
- * memory while messing with kernel MMU state. By
- * dynamic memory I mean any object which is not in
- * the kernel image itself or a thread_union (both of
- * which are locked into the MMU).
- * 2) Disable interrupts while messing with user MMU state.
- */
-
-extern int num_segmaps, num_contexts;
-
-extern unsigned long page_kernel;
-
-/* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
- * So let's save some cycles and just use that everywhere except for that bootup
- * sanity check.
- */
-#define SUN4C_VAC_SIZE 65536
-
-#define SUN4C_KERNEL_BUCKETS 32
-
-/* Flushing the cache. */
-struct sun4c_vac_props sun4c_vacinfo;
-unsigned long sun4c_kernel_faults;
-
-/* Invalidate every sun4c cache line tag. */
-static void __init sun4c_flush_all(void)
-{
- unsigned long begin, end;
-
- if (sun4c_vacinfo.on)
- panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
-
- /* Clear 'valid' bit in all cache line tags */
- begin = AC_CACHETAGS;
- end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
- while (begin < end) {
- __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
- "r" (begin), "i" (ASI_CONTROL));
- begin += sun4c_vacinfo.linesize;
- }
-}
-
-static void sun4c_flush_context_hw(void)
-{
- unsigned long end = SUN4C_VAC_SIZE;
-
- __asm__ __volatile__(
- "1: addcc %0, -4096, %0\n\t"
- " bne 1b\n\t"
- " sta %%g0, [%0] %2"
- : "=&r" (end)
- : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
- : "cc");
-}
-
-/* Must be called minimally with IRQs disabled. */
-static void sun4c_flush_segment_hw(unsigned long addr)
-{
- if (sun4c_get_segmap(addr) != invalid_segment) {
- unsigned long vac_size = SUN4C_VAC_SIZE;
-
- __asm__ __volatile__(
- "1: addcc %0, -4096, %0\n\t"
- " bne 1b\n\t"
- " sta %%g0, [%2 + %0] %3"
- : "=&r" (vac_size)
- : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
- : "cc");
- }
-}
-
-/* File local boot time fixups. */
-BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
-BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
-BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
-
-#define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
-#define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
-#define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
-
-/* Must be called minimally with interrupts disabled. */
-static void sun4c_flush_page_hw(unsigned long addr)
-{
- addr &= PAGE_MASK;
- if ((int)sun4c_get_pte(addr) < 0)
- __asm__ __volatile__("sta %%g0, [%0] %1"
- : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
-}
-
-/* Don't inline the software version as it eats too many cache lines if expanded. */
-static void sun4c_flush_context_sw(void)
-{
- unsigned long nbytes = SUN4C_VAC_SIZE;
- unsigned long lsize = sun4c_vacinfo.linesize;
-
- __asm__ __volatile__(
- "add %2, %2, %%g1\n\t"
- "add %2, %%g1, %%g2\n\t"
- "add %2, %%g2, %%g3\n\t"
- "add %2, %%g3, %%g4\n\t"
- "add %2, %%g4, %%g5\n\t"
- "add %2, %%g5, %%o4\n\t"
- "add %2, %%o4, %%o5\n"
- "1:\n\t"
- "subcc %0, %%o5, %0\n\t"
- "sta %%g0, [%0] %3\n\t"
- "sta %%g0, [%0 + %2] %3\n\t"
- "sta %%g0, [%0 + %%g1] %3\n\t"
- "sta %%g0, [%0 + %%g2] %3\n\t"
- "sta %%g0, [%0 + %%g3] %3\n\t"
- "sta %%g0, [%0 + %%g4] %3\n\t"
- "sta %%g0, [%0 + %%g5] %3\n\t"
- "bg 1b\n\t"
- " sta %%g0, [%1 + %%o4] %3\n"
- : "=&r" (nbytes)
- : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
- : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
-}
-
-/* Don't inline the software version as it eats too many cache lines if expanded. */
-static void sun4c_flush_segment_sw(unsigned long addr)
-{
- if (sun4c_get_segmap(addr) != invalid_segment) {
- unsigned long nbytes = SUN4C_VAC_SIZE;
- unsigned long lsize = sun4c_vacinfo.linesize;
-
- __asm__ __volatile__(
- "add %2, %2, %%g1\n\t"
- "add %2, %%g1, %%g2\n\t"
- "add %2, %%g2, %%g3\n\t"
- "add %2, %%g3, %%g4\n\t"
- "add %2, %%g4, %%g5\n\t"
- "add %2, %%g5, %%o4\n\t"
- "add %2, %%o4, %%o5\n"
- "1:\n\t"
- "subcc %1, %%o5, %1\n\t"
- "sta %%g0, [%0] %6\n\t"
- "sta %%g0, [%0 + %2] %6\n\t"
- "sta %%g0, [%0 + %%g1] %6\n\t"
- "sta %%g0, [%0 + %%g2] %6\n\t"
- "sta %%g0, [%0 + %%g3] %6\n\t"
- "sta %%g0, [%0 + %%g4] %6\n\t"
- "sta %%g0, [%0 + %%g5] %6\n\t"
- "sta %%g0, [%0 + %%o4] %6\n\t"
- "bg 1b\n\t"
- " add %0, %%o5, %0\n"
- : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
- : "0" (addr), "1" (nbytes), "2" (lsize),
- "i" (ASI_FLUSHSEG)
- : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
- }
-}
-
-/* Don't inline the software version as it eats too many cache lines if expanded. */
-static void sun4c_flush_page_sw(unsigned long addr)
-{
- addr &= PAGE_MASK;
- if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
- _SUN4C_PAGE_VALID) {
- unsigned long left = PAGE_SIZE;
- unsigned long lsize = sun4c_vacinfo.linesize;
-
- __asm__ __volatile__(
- "add %2, %2, %%g1\n\t"
- "add %2, %%g1, %%g2\n\t"
- "add %2, %%g2, %%g3\n\t"
- "add %2, %%g3, %%g4\n\t"
- "add %2, %%g4, %%g5\n\t"
- "add %2, %%g5, %%o4\n\t"
- "add %2, %%o4, %%o5\n"
- "1:\n\t"
- "subcc %1, %%o5, %1\n\t"
- "sta %%g0, [%0] %6\n\t"
- "sta %%g0, [%0 + %2] %6\n\t"
- "sta %%g0, [%0 + %%g1] %6\n\t"
- "sta %%g0, [%0 + %%g2] %6\n\t"
- "sta %%g0, [%0 + %%g3] %6\n\t"
- "sta %%g0, [%0 + %%g4] %6\n\t"
- "sta %%g0, [%0 + %%g5] %6\n\t"
- "sta %%g0, [%0 + %%o4] %6\n\t"
- "bg 1b\n\t"
- " add %0, %%o5, %0\n"
- : "=&r" (addr), "=&r" (left), "=&r" (lsize)
- : "0" (addr), "1" (left), "2" (lsize),
- "i" (ASI_FLUSHPG)
- : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
- }
-}
-
-/* The sun4c's do have an on chip store buffer. And the way you
- * clear them out isn't so obvious. The only way I can think of
- * to accomplish this is to read the current context register,
- * store the same value there, then read an external hardware
- * register.
- */
-void sun4c_complete_all_stores(void)
-{
- volatile int _unused;
-
- _unused = sun4c_get_context();
- sun4c_set_context(_unused);
- _unused = get_auxio();
-}
-
-/* Bootup utility functions. */
-static inline void sun4c_init_clean_segmap(unsigned char pseg)
-{
- unsigned long vaddr;
-
- sun4c_put_segmap(0, pseg);
- for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
- sun4c_put_pte(vaddr, 0);
- sun4c_put_segmap(0, invalid_segment);
-}
-
-static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
-{
- unsigned long vaddr;
- unsigned char savectx, ctx;
-
- savectx = sun4c_get_context();
- for (ctx = 0; ctx < num_contexts; ctx++) {
- sun4c_set_context(ctx);
- for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
- sun4c_put_segmap(vaddr, invalid_segment);
- for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
- sun4c_put_segmap(vaddr, invalid_segment);
- for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
- sun4c_put_segmap(vaddr, invalid_segment);
- for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
- sun4c_put_segmap(vaddr, invalid_segment);
- }
- sun4c_set_context(savectx);
-}
-
-void __init sun4c_probe_vac(void)
-{
- sun4c_disable_vac();
-
- if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
- (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
- /* PROM on SS1 lacks this info, to be super safe we
- * hard code it here since this arch is cast in stone.
- */
- sun4c_vacinfo.num_bytes = 65536;
- sun4c_vacinfo.linesize = 16;
- } else {
- sun4c_vacinfo.num_bytes =
- prom_getintdefault(prom_root_node, "vac-size", 65536);
- sun4c_vacinfo.linesize =
- prom_getintdefault(prom_root_node, "vac-linesize", 16);
- }
- sun4c_vacinfo.do_hwflushes =
- prom_getintdefault(prom_root_node, "vac-hwflush", 0);
-
- if (sun4c_vacinfo.do_hwflushes == 0)
- sun4c_vacinfo.do_hwflushes =
- prom_getintdefault(prom_root_node, "vac_hwflush", 0);
-
- if (sun4c_vacinfo.num_bytes != 65536) {
- prom_printf("WEIRD Sun4C VAC cache size, "
- "tell sparclinux@vger.kernel.org");
- prom_halt();
- }
-
- switch (sun4c_vacinfo.linesize) {
- case 16:
- sun4c_vacinfo.log2lsize = 4;
- break;
- case 32:
- sun4c_vacinfo.log2lsize = 5;
- break;
- default:
- prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
- sun4c_vacinfo.linesize);
- prom_halt();
- }
-
- sun4c_flush_all();
- sun4c_enable_vac();
-}
-
-/* Patch instructions for the low level kernel fault handler. */
-extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
-extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
-extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
-extern unsigned long num_context_patch1, num_context_patch1_16;
-extern unsigned long num_context_patch2_16;
-extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
-extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
-extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
-
-#define PATCH_INSN(src, dst) do { \
- daddr = &(dst); \
- iaddr = &(src); \
- *daddr = *iaddr; \
- } while (0)
-
-static void __init patch_kernel_fault_handler(void)
-{
- unsigned long *iaddr, *daddr;
-
- switch (num_segmaps) {
- case 128:
- /* Default, nothing to do. */
- break;
- case 256:
- PATCH_INSN(invalid_segment_patch1_ff,
- invalid_segment_patch1);
- PATCH_INSN(invalid_segment_patch2_ff,
- invalid_segment_patch2);
- break;
- case 512:
- PATCH_INSN(invalid_segment_patch1_1ff,
- invalid_segment_patch1);
- PATCH_INSN(invalid_segment_patch2_1ff,
- invalid_segment_patch2);
- break;
- default:
- prom_printf("Unhandled number of segmaps: %d\n",
- num_segmaps);
- prom_halt();
- }
- switch (num_contexts) {
- case 8:
- /* Default, nothing to do. */
- break;
- case 16:
- PATCH_INSN(num_context_patch1_16,
- num_context_patch1);
- break;
- default:
- prom_printf("Unhandled number of contexts: %d\n",
- num_contexts);
- prom_halt();
- }
-
- if (sun4c_vacinfo.do_hwflushes != 0) {
- PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
- PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
- } else {
- switch (sun4c_vacinfo.linesize) {
- case 16:
- /* Default, nothing to do. */
- break;
- case 32:
- PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
- break;
- default:
- prom_printf("Impossible VAC linesize %d, halting...\n",
- sun4c_vacinfo.linesize);
- prom_halt();
- }
- }
-}
-
-static void __init sun4c_probe_mmu(void)
-{
- if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
- (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
- /* Hardcode these just to be safe, PROM on SS1 does
- * not have this info available in the root node.
- */
- num_segmaps = 128;
- num_contexts = 8;
- } else {
- num_segmaps =
- prom_getintdefault(prom_root_node, "mmu-npmg", 128);
- num_contexts =
- prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
- }
- patch_kernel_fault_handler();
-}
-
-volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
-
-void __init sun4c_probe_memerr_reg(void)
-{
- phandle node;
- struct linux_prom_registers regs[1];
-
- node = prom_getchild(prom_root_node);
- node = prom_searchsiblings(prom_root_node, "memory-error");
- if (!node)
- return;
- if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
- return;
- /* hmm I think regs[0].which_io is zero here anyways */
- sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
-}
-
-static inline void sun4c_init_ss2_cache_bug(void)
-{
- if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
- (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
- (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
- /* Whee.. */
- printk("SS2 cache bug detected, uncaching trap table page\n");
- sun4c_flush_page((unsigned int) &_start);
- sun4c_put_pte(((unsigned long) &_start),
- (sun4c_get_pte((unsigned long) &_start) | _SUN4C_PAGE_NOCACHE));
- }
-}
-
-/* Addr is always aligned on a page boundary for us already. */
-static int sun4c_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va,
- unsigned long addr, int len)
-{
- unsigned long page, end;
-
- *pba = addr;
-
- end = PAGE_ALIGN((addr + len));
- while (addr < end) {
- page = va;
- sun4c_flush_page(page);
- page -= PAGE_OFFSET;
- page >>= PAGE_SHIFT;
- page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
- _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
- sun4c_put_pte(addr, page);
- addr += PAGE_SIZE;
- va += PAGE_SIZE;
- }
-
- return 0;
-}
-
-static void sun4c_unmap_dma_area(struct device *dev, unsigned long busa, int len)
-{
- /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
- /* XXX Implement this */
-}
-
-/* TLB management. */
-
-/* Don't change this struct without changing entry.S. This is used
- * in the in-window kernel fault handler, and you don't want to mess
- * with that. (See sun4c_fault in entry.S).
- */
-struct sun4c_mmu_entry {
- struct sun4c_mmu_entry *next;
- struct sun4c_mmu_entry *prev;
- unsigned long vaddr;
- unsigned char pseg;
- unsigned char locked;
-
- /* For user mappings only, and completely hidden from kernel
- * TLB miss code.
- */
- unsigned char ctx;
- struct sun4c_mmu_entry *lru_next;
- struct sun4c_mmu_entry *lru_prev;
-};
-
-static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
-
-static void __init sun4c_init_mmu_entry_pool(void)
-{
- int i;
-
- for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
- mmu_entry_pool[i].pseg = i;
- mmu_entry_pool[i].next = NULL;
- mmu_entry_pool[i].prev = NULL;
- mmu_entry_pool[i].vaddr = 0;
- mmu_entry_pool[i].locked = 0;
- mmu_entry_pool[i].ctx = 0;
- mmu_entry_pool[i].lru_next = NULL;
- mmu_entry_pool[i].lru_prev = NULL;
- }
- mmu_entry_pool[invalid_segment].locked = 1;
-}
-
-static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
- unsigned long bits_off)
-{
- unsigned long start, end;
-
- end = vaddr + SUN4C_REAL_PGDIR_SIZE;
- for (start = vaddr; start < end; start += PAGE_SIZE)
- if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
- sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
- ~bits_off);
-}
-
-static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
-{
- unsigned long vaddr;
- unsigned char pseg, ctx;
-
- for (vaddr = KADB_DEBUGGER_BEGVM;
- vaddr < LINUX_OPPROM_ENDVM;
- vaddr += SUN4C_REAL_PGDIR_SIZE) {
- pseg = sun4c_get_segmap(vaddr);
- if (pseg != invalid_segment) {
- mmu_entry_pool[pseg].locked = 1;
- for (ctx = 0; ctx < num_contexts; ctx++)
- prom_putsegment(ctx, vaddr, pseg);
- fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
- }
- }
-
- for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
- pseg = sun4c_get_segmap(vaddr);
- mmu_entry_pool[pseg].locked = 1;
- for (ctx = 0; ctx < num_contexts; ctx++)
- prom_putsegment(ctx, vaddr, pseg);
- fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
- }
-}
-
-static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
-{
- int i, ctx;
-
- while (start < end) {
- for (i = 0; i < invalid_segment; i++)
- if (!mmu_entry_pool[i].locked)
- break;
- mmu_entry_pool[i].locked = 1;
- sun4c_init_clean_segmap(i);
- for (ctx = 0; ctx < num_contexts; ctx++)
- prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
- start += SUN4C_REAL_PGDIR_SIZE;
- }
-}
-
-/* Don't change this struct without changing entry.S. This is used
- * in the in-window kernel fault handler, and you don't want to mess
- * with that. (See sun4c_fault in entry.S).
- */
-struct sun4c_mmu_ring {
- struct sun4c_mmu_entry ringhd;
- int num_entries;
-};
-
-static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
-static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */
-static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */
-struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */
-struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */
-
-static inline void sun4c_init_rings(void)
-{
- int i;
-
- for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
- sun4c_context_ring[i].ringhd.next =
- sun4c_context_ring[i].ringhd.prev =
- &sun4c_context_ring[i].ringhd;
- sun4c_context_ring[i].num_entries = 0;
- }
- sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
- &sun4c_ufree_ring.ringhd;
- sun4c_ufree_ring.num_entries = 0;
- sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
- &sun4c_ulru_ring.ringhd;
- sun4c_ulru_ring.num_entries = 0;
- sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
- &sun4c_kernel_ring.ringhd;
- sun4c_kernel_ring.num_entries = 0;
- sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
- &sun4c_kfree_ring.ringhd;
- sun4c_kfree_ring.num_entries = 0;
-}
-
-static void add_ring(struct sun4c_mmu_ring *ring,
- struct sun4c_mmu_entry *entry)
-{
- struct sun4c_mmu_entry *head = &ring->ringhd;
-
- entry->prev = head;
- (entry->next = head->next)->prev = entry;
- head->next = entry;
- ring->num_entries++;
-}
-
-static inline void add_lru(struct sun4c_mmu_entry *entry)
-{
- struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
- struct sun4c_mmu_entry *head = &ring->ringhd;
-
- entry->lru_next = head;
- (entry->lru_prev = head->lru_prev)->lru_next = entry;
- head->lru_prev = entry;
-}
-
-static void add_ring_ordered(struct sun4c_mmu_ring *ring,
- struct sun4c_mmu_entry *entry)
-{
- struct sun4c_mmu_entry *head = &ring->ringhd;
- unsigned long addr = entry->vaddr;
-
- while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
- head = head->next;
-
- entry->prev = head;
- (entry->next = head->next)->prev = entry;
- head->next = entry;
- ring->num_entries++;
-
- add_lru(entry);
-}
-
-static inline void remove_ring(struct sun4c_mmu_ring *ring,
- struct sun4c_mmu_entry *entry)
-{
- struct sun4c_mmu_entry *next = entry->next;
-
- (next->prev = entry->prev)->next = next;
- ring->num_entries--;
-}
-
-static void remove_lru(struct sun4c_mmu_entry *entry)
-{
- struct sun4c_mmu_entry *next = entry->lru_next;
-
- (next->lru_prev = entry->lru_prev)->lru_next = next;
-}
-
-static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
-{
- remove_ring(sun4c_context_ring+ctx, entry);
- remove_lru(entry);
- add_ring(&sun4c_ufree_ring, entry);
-}
-
-static void free_kernel_entry(struct sun4c_mmu_entry *entry,
- struct sun4c_mmu_ring *ring)
-{
- remove_ring(ring, entry);
- add_ring(&sun4c_kfree_ring, entry);
-}
-
-static void __init sun4c_init_fill_kernel_ring(int howmany)
-{
- int i;
-
- while (howmany) {
- for (i = 0; i < invalid_segment; i++)
- if (!mmu_entry_pool[i].locked)
- break;
- mmu_entry_pool[i].locked = 1;
- sun4c_init_clean_segmap(i);
- add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
- howmany--;
- }
-}
-
-static void __init sun4c_init_fill_user_ring(void)
-{
- int i;
-
- for (i = 0; i < invalid_segment; i++) {
- if (mmu_entry_pool[i].locked)
- continue;
- sun4c_init_clean_segmap(i);
- add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
- }
-}
-
-static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
-{
- int savectx, ctx;
-
- savectx = sun4c_get_context();
- for (ctx = 0; ctx < num_contexts; ctx++) {
- sun4c_set_context(ctx);
- sun4c_put_segmap(kentry->vaddr, invalid_segment);
- }
- sun4c_set_context(savectx);
-}
-
-static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
-{
- int savectx, ctx;
-
- savectx = sun4c_get_context();
- for (ctx = 0; ctx < num_contexts; ctx++) {
- sun4c_set_context(ctx);
- sun4c_put_segmap(kentry->vaddr, kentry->pseg);
- }
- sun4c_set_context(savectx);
-}
-
-#define sun4c_user_unmap(__entry) \
- sun4c_put_segmap((__entry)->vaddr, invalid_segment)
-
-static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
-{
- struct sun4c_mmu_entry *head = &crp->ringhd;
- unsigned long flags;
-
- local_irq_save(flags);
- if (head->next != head) {
- struct sun4c_mmu_entry *entry = head->next;
- int savectx = sun4c_get_context();
-
- flush_user_windows();
- sun4c_set_context(ctx);
- sun4c_flush_context();
- do {
- struct sun4c_mmu_entry *next = entry->next;
-
- sun4c_user_unmap(entry);
- free_user_entry(ctx, entry);
-
- entry = next;
- } while (entry != head);
- sun4c_set_context(savectx);
- }
- local_irq_restore(flags);
-}
-
-static int sun4c_user_taken_entries; /* This is how much we have. */
-static int max_user_taken_entries; /* This limits us and prevents deadlock. */
-
-static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
-{
- struct sun4c_mmu_entry *this_entry;
-
- /* If some are free, return first one. */
- if (sun4c_kfree_ring.num_entries) {
- this_entry = sun4c_kfree_ring.ringhd.next;
- return this_entry;
- }
-
- /* Else free one up. */
- this_entry = sun4c_kernel_ring.ringhd.prev;
- sun4c_flush_segment(this_entry->vaddr);
- sun4c_kernel_unmap(this_entry);
- free_kernel_entry(this_entry, &sun4c_kernel_ring);
- this_entry = sun4c_kfree_ring.ringhd.next;
-
- return this_entry;
-}
-
-/* Using this method to free up mmu entries eliminates a lot of
- * potential races since we have a kernel that incurs tlb
- * replacement faults. There may be performance penalties.
- *
- * NOTE: Must be called with interrupts disabled.
- */
-static struct sun4c_mmu_entry *sun4c_user_strategy(void)
-{
- struct sun4c_mmu_entry *entry;
- unsigned char ctx;
- int savectx;
-
- /* If some are free, return first one. */
- if (sun4c_ufree_ring.num_entries) {
- entry = sun4c_ufree_ring.ringhd.next;
- goto unlink_out;
- }
-
- if (sun4c_user_taken_entries) {
- entry = sun4c_kernel_strategy();
- sun4c_user_taken_entries--;
- goto kunlink_out;
- }
-
- /* Grab from the beginning of the LRU list. */
- entry = sun4c_ulru_ring.ringhd.lru_next;
- ctx = entry->ctx;
-
- savectx = sun4c_get_context();
- flush_user_windows();
- sun4c_set_context(ctx);
- sun4c_flush_segment(entry->vaddr);
- sun4c_user_unmap(entry);
- remove_ring(sun4c_context_ring + ctx, entry);
- remove_lru(entry);
- sun4c_set_context(savectx);
-
- return entry;
-
-unlink_out:
- remove_ring(&sun4c_ufree_ring, entry);
- return entry;
-kunlink_out:
- remove_ring(&sun4c_kfree_ring, entry);
- return entry;
-}
-
-/* NOTE: Must be called with interrupts disabled. */
-void sun4c_grow_kernel_ring(void)
-{
- struct sun4c_mmu_entry *entry;
-
- /* Prevent deadlock condition. */
- if (sun4c_user_taken_entries >= max_user_taken_entries)
- return;
-
- if (sun4c_ufree_ring.num_entries) {
- entry = sun4c_ufree_ring.ringhd.next;
- remove_ring(&sun4c_ufree_ring, entry);
- add_ring(&sun4c_kfree_ring, entry);
- sun4c_user_taken_entries++;
- }
-}
-
-/* 2 page buckets for task struct and kernel stack allocation.
- *
- * TASK_STACK_BEGIN
- * bucket[0]
- * bucket[1]
- * [ ... ]
- * bucket[NR_TASK_BUCKETS-1]
- * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
- *
- * Each slot looks like:
- *
- * page 1 -- task struct + beginning of kernel stack
- * page 2 -- rest of kernel stack
- */
-
-union task_union *sun4c_bucket[NR_TASK_BUCKETS];
-
-static int sun4c_lowbucket_avail;
-
-#define BUCKET_EMPTY ((union task_union *) 0)
-#define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */
-#define BUCKET_SIZE (1 << BUCKET_SHIFT)
-#define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
-#define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
-#define BUCKET_PTE(page) \
- ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
-#define BUCKET_PTE_PAGE(pte) \
- (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
-
-static void get_locked_segment(unsigned long addr)
-{
- struct sun4c_mmu_entry *stolen;
- unsigned long flags;
-
- local_irq_save(flags);
- addr &= SUN4C_REAL_PGDIR_MASK;
- stolen = sun4c_user_strategy();
- max_user_taken_entries--;
- stolen->vaddr = addr;
- flush_user_windows();
- sun4c_kernel_map(stolen);
- local_irq_restore(flags);
-}
-
-static void free_locked_segment(unsigned long addr)
-{
- struct sun4c_mmu_entry *entry;
- unsigned long flags;
- unsigned char pseg;
-
- local_irq_save(flags);
- addr &= SUN4C_REAL_PGDIR_MASK;
- pseg = sun4c_get_segmap(addr);
- entry = &mmu_entry_pool[pseg];
-
- flush_user_windows();
- sun4c_flush_segment(addr);
- sun4c_kernel_unmap(entry);
- add_ring(&sun4c_ufree_ring, entry);
- max_user_taken_entries++;
- local_irq_restore(flags);
-}
-
-static inline void garbage_collect(int entry)
-{
- int start, end;
-
- /* 32 buckets per segment... */
- entry &= ~31;
- start = entry;
- for (end = (start + 32); start < end; start++)
- if (sun4c_bucket[start] != BUCKET_EMPTY)
- return;
-
- /* Entire segment empty, release it. */
- free_locked_segment(BUCKET_ADDR(entry));
-}
-
-static struct thread_info *sun4c_alloc_thread_info_node(int node)
-{
- unsigned long addr, pages;
- int entry;
-
- pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
- if (!pages)
- return NULL;
-
- for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
- if (sun4c_bucket[entry] == BUCKET_EMPTY)
- break;
- if (entry == NR_TASK_BUCKETS) {
- free_pages(pages, THREAD_INFO_ORDER);
- return NULL;
- }
- if (entry >= sun4c_lowbucket_avail)
- sun4c_lowbucket_avail = entry + 1;
-
- addr = BUCKET_ADDR(entry);
- sun4c_bucket[entry] = (union task_union *) addr;
- if(sun4c_get_segmap(addr) == invalid_segment)
- get_locked_segment(addr);
-
- /* We are changing the virtual color of the page(s)
- * so we must flush the cache to guarantee consistency.
- */
- sun4c_flush_page(pages);
- sun4c_flush_page(pages + PAGE_SIZE);
-
- sun4c_put_pte(addr, BUCKET_PTE(pages));
- sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
-
-#ifdef CONFIG_DEBUG_STACK_USAGE
- memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
-#endif /* DEBUG_STACK_USAGE */
-
- return (struct thread_info *) addr;
-}
-
-static void sun4c_free_thread_info(struct thread_info *ti)
-{
- unsigned long tiaddr = (unsigned long) ti;
- unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
- int entry = BUCKET_NUM(tiaddr);
-
- /* We are deleting a mapping, so the flush here is mandatory. */
- sun4c_flush_page(tiaddr);
- sun4c_flush_page(tiaddr + PAGE_SIZE);
-
- sun4c_put_pte(tiaddr, 0);
- sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
-
- sun4c_bucket[entry] = BUCKET_EMPTY;
- if (entry < sun4c_lowbucket_avail)
- sun4c_lowbucket_avail = entry;
-
- free_pages(pages, THREAD_INFO_ORDER);
- garbage_collect(entry);
-}
-
-static void __init sun4c_init_buckets(void)
-{
- int entry;
-
- if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
- extern void thread_info_size_is_bolixed_pete(void);
- thread_info_size_is_bolixed_pete();
- }
-
- for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
- sun4c_bucket[entry] = BUCKET_EMPTY;
- sun4c_lowbucket_avail = 0;
-}
-
-static unsigned long sun4c_iobuffer_start;
-static unsigned long sun4c_iobuffer_end;
-static unsigned long sun4c_iobuffer_high;
-static unsigned long *sun4c_iobuffer_map;
-static int iobuffer_map_size;
-
-/*
- * Alias our pages so they do not cause a trap.
- * Also one page may be aliased into several I/O areas and we may
- * finish these I/O separately.
- */
-static char *sun4c_lockarea(char *vaddr, unsigned long size)
-{
- unsigned long base, scan;
- unsigned long npages;
- unsigned long vpage;
- unsigned long pte;
- unsigned long apage;
- unsigned long high;
- unsigned long flags;
-
- npages = (((unsigned long)vaddr & ~PAGE_MASK) +
- size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
-
- local_irq_save(flags);
- base = bitmap_find_next_zero_area(sun4c_iobuffer_map, iobuffer_map_size,
- 0, npages, 0);
- if (base >= iobuffer_map_size)
- goto abend;
-
- high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
- high = SUN4C_REAL_PGDIR_ALIGN(high);
- while (high > sun4c_iobuffer_high) {
- get_locked_segment(sun4c_iobuffer_high);
- sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
- }
-
- vpage = ((unsigned long) vaddr) & PAGE_MASK;
- for (scan = base; scan < base+npages; scan++) {
- pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
- pte |= pgprot_val(SUN4C_PAGE_KERNEL);
- pte |= _SUN4C_PAGE_NOCACHE;
- set_bit(scan, sun4c_iobuffer_map);
- apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
-
- /* Flush original mapping so we see the right things later. */
- sun4c_flush_page(vpage);
-
- sun4c_put_pte(apage, pte);
- vpage += PAGE_SIZE;
- }
- local_irq_restore(flags);
- return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
- (((unsigned long) vaddr) & ~PAGE_MASK));
-
-abend:
- local_irq_restore(flags);
- printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
- panic("Out of iobuffer table");
- return NULL;
-}
-
-static void sun4c_unlockarea(char *vaddr, unsigned long size)
-{
- unsigned long vpage, npages;
- unsigned long flags;
- int scan, high;
-
- vpage = (unsigned long)vaddr & PAGE_MASK;
- npages = (((unsigned long)vaddr & ~PAGE_MASK) +
- size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
-
- local_irq_save(flags);
- while (npages != 0) {
- --npages;
-
- /* This mapping is marked non-cachable, no flush necessary. */
- sun4c_put_pte(vpage, 0);
- clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
- sun4c_iobuffer_map);
- vpage += PAGE_SIZE;
- }
-
- /* garbage collect */
- scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
- while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
- scan -= 32;
- scan += 32;
- high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
- high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
- while (high < sun4c_iobuffer_high) {
- sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
- free_locked_segment(sun4c_iobuffer_high);
- }
- local_irq_restore(flags);
-}
-
-/* Note the scsi code at init time passes to here buffers
- * which sit on the kernel stack, those are already locked
- * by implication and fool the page locking code above
- * if passed to by mistake.
- */
-static __u32 sun4c_get_scsi_one(struct device *dev, char *bufptr, unsigned long len)
-{
- unsigned long page;
-
- page = ((unsigned long)bufptr) & PAGE_MASK;
- if (!virt_addr_valid(page)) {
- sun4c_flush_page(page);
- return (__u32)bufptr; /* already locked */
- }
- return (__u32)sun4c_lockarea(bufptr, len);
-}
-
-static void sun4c_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
-{
- while (sz != 0) {
- --sz;
- sg->dma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length);
- sg->dma_length = sg->length;
- sg = sg_next(sg);
- }
-}
-
-static void sun4c_release_scsi_one(struct device *dev, __u32 bufptr, unsigned long len)
-{
- if (bufptr < sun4c_iobuffer_start)
- return; /* On kernel stack or similar, see above */
- sun4c_unlockarea((char *)bufptr, len);
-}
-
-static void sun4c_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
-{
- while (sz != 0) {
- --sz;
- sun4c_unlockarea((char *)sg->dma_address, sg->length);
- sg = sg_next(sg);
- }
-}
-
-#define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */
-#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
-
-struct vm_area_struct sun4c_kstack_vma;
-
-static void __init sun4c_init_lock_areas(void)
-{
- unsigned long sun4c_taskstack_start;
- unsigned long sun4c_taskstack_end;
- int bitmap_size;
-
- sun4c_init_buckets();
- sun4c_taskstack_start = SUN4C_LOCK_VADDR;
- sun4c_taskstack_end = (sun4c_taskstack_start +
- (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
- if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
- prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
- prom_halt();
- }
-
- sun4c_iobuffer_start = sun4c_iobuffer_high =
- SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
- sun4c_iobuffer_end = SUN4C_LOCK_END;
- bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
- bitmap_size = (bitmap_size + 7) >> 3;
- bitmap_size = LONG_ALIGN(bitmap_size);
- iobuffer_map_size = bitmap_size << 3;
- sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
- memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
-
- sun4c_kstack_vma.vm_mm = &init_mm;
- sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
- sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
- sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
- sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
- insert_vm_struct(&init_mm, &sun4c_kstack_vma);
-}
-
-/* Cache flushing on the sun4c. */
-static void sun4c_flush_cache_all(void)
-{
- unsigned long begin, end;
-
- flush_user_windows();
- begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
- end = (begin + SUN4C_VAC_SIZE);
-
- if (sun4c_vacinfo.linesize == 32) {
- while (begin < end) {
- __asm__ __volatile__(
- "ld [%0 + 0x00], %%g0\n\t"
- "ld [%0 + 0x20], %%g0\n\t"
- "ld [%0 + 0x40], %%g0\n\t"
- "ld [%0 + 0x60], %%g0\n\t"
- "ld [%0 + 0x80], %%g0\n\t"
- "ld [%0 + 0xa0], %%g0\n\t"
- "ld [%0 + 0xc0], %%g0\n\t"
- "ld [%0 + 0xe0], %%g0\n\t"
- "ld [%0 + 0x100], %%g0\n\t"
- "ld [%0 + 0x120], %%g0\n\t"
- "ld [%0 + 0x140], %%g0\n\t"
- "ld [%0 + 0x160], %%g0\n\t"
- "ld [%0 + 0x180], %%g0\n\t"
- "ld [%0 + 0x1a0], %%g0\n\t"
- "ld [%0 + 0x1c0], %%g0\n\t"
- "ld [%0 + 0x1e0], %%g0\n"
- : : "r" (begin));
- begin += 512;
- }
- } else {
- while (begin < end) {
- __asm__ __volatile__(
- "ld [%0 + 0x00], %%g0\n\t"
- "ld [%0 + 0x10], %%g0\n\t"
- "ld [%0 + 0x20], %%g0\n\t"
- "ld [%0 + 0x30], %%g0\n\t"
- "ld [%0 + 0x40], %%g0\n\t"
- "ld [%0 + 0x50], %%g0\n\t"
- "ld [%0 + 0x60], %%g0\n\t"
- "ld [%0 + 0x70], %%g0\n\t"
- "ld [%0 + 0x80], %%g0\n\t"
- "ld [%0 + 0x90], %%g0\n\t"
- "ld [%0 + 0xa0], %%g0\n\t"
- "ld [%0 + 0xb0], %%g0\n\t"
- "ld [%0 + 0xc0], %%g0\n\t"
- "ld [%0 + 0xd0], %%g0\n\t"
- "ld [%0 + 0xe0], %%g0\n\t"
- "ld [%0 + 0xf0], %%g0\n"
- : : "r" (begin));
- begin += 256;
- }
- }
-}
-
-static void sun4c_flush_cache_mm(struct mm_struct *mm)
-{
- int new_ctx = mm->context;
-
- if (new_ctx != NO_CONTEXT) {
- flush_user_windows();
-
- if (sun4c_context_ring[new_ctx].num_entries) {
- struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
- unsigned long flags;
-
- local_irq_save(flags);
- if (head->next != head) {
- struct sun4c_mmu_entry *entry = head->next;
- int savectx = sun4c_get_context();
-
- sun4c_set_context(new_ctx);
- sun4c_flush_context();
- do {
- struct sun4c_mmu_entry *next = entry->next;
-
- sun4c_user_unmap(entry);
- free_user_entry(new_ctx, entry);
-
- entry = next;
- } while (entry != head);
- sun4c_set_context(savectx);
- }
- local_irq_restore(flags);
- }
- }
-}
-
-static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
-{
- struct mm_struct *mm = vma->vm_mm;
- int new_ctx = mm->context;
-
- if (new_ctx != NO_CONTEXT) {
- struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
- struct sun4c_mmu_entry *entry;
- unsigned long flags;
-
- flush_user_windows();
-
- local_irq_save(flags);
- /* All user segmap chains are ordered on entry->vaddr. */
- for (entry = head->next;
- (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
- entry = entry->next)
- ;
-
- /* Tracing various job mixtures showed that this conditional
- * only passes ~35% of the time for most worse case situations,
- * therefore we avoid all of this gross overhead ~65% of the time.
- */
- if ((entry != head) && (entry->vaddr < end)) {
- int octx = sun4c_get_context();
- sun4c_set_context(new_ctx);
-
- /* At this point, always, (start >= entry->vaddr) and
- * (entry->vaddr < end), once the latter condition
- * ceases to hold, or we hit the end of the list, we
- * exit the loop. The ordering of all user allocated
- * segmaps makes this all work out so beautifully.
- */
- do {
- struct sun4c_mmu_entry *next = entry->next;
- unsigned long realend;
-
- /* "realstart" is always >= entry->vaddr */
- realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
- if (end < realend)
- realend = end;
- if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
- unsigned long page = entry->vaddr;
- while (page < realend) {
- sun4c_flush_page(page);
- page += PAGE_SIZE;
- }
- } else {
- sun4c_flush_segment(entry->vaddr);
- sun4c_user_unmap(entry);
- free_user_entry(new_ctx, entry);
- }
- entry = next;
- } while ((entry != head) && (entry->vaddr < end));
- sun4c_set_context(octx);
- }
- local_irq_restore(flags);
- }
-}
-
-static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
-{
- struct mm_struct *mm = vma->vm_mm;
- int new_ctx = mm->context;
-
- /* Sun4c has no separate I/D caches so cannot optimize for non
- * text page flushes.
- */
- if (new_ctx != NO_CONTEXT) {
- int octx = sun4c_get_context();
- unsigned long flags;
-
- flush_user_windows();
- local_irq_save(flags);
- sun4c_set_context(new_ctx);
- sun4c_flush_page(page);
- sun4c_set_context(octx);
- local_irq_restore(flags);
- }
-}
-
-static void sun4c_flush_page_to_ram(unsigned long page)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- sun4c_flush_page(page);
- local_irq_restore(flags);
-}
-
-/* Sun4c cache is unified, both instructions and data live there, so
- * no need to flush the on-stack instructions for new signal handlers.
- */
-static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
-{
-}
-
-/* TLB flushing on the sun4c. These routines count on the cache
- * flushing code to flush the user register windows so that we need
- * not do so when we get here.
- */
-
-static void sun4c_flush_tlb_all(void)
-{
- struct sun4c_mmu_entry *this_entry, *next_entry;
- unsigned long flags;
- int savectx, ctx;
-
- local_irq_save(flags);
- this_entry = sun4c_kernel_ring.ringhd.next;
- savectx = sun4c_get_context();
- flush_user_windows();
- while (sun4c_kernel_ring.num_entries) {
- next_entry = this_entry->next;
- sun4c_flush_segment(this_entry->vaddr);
- for (ctx = 0; ctx < num_contexts; ctx++) {
- sun4c_set_context(ctx);
- sun4c_put_segmap(this_entry->vaddr, invalid_segment);
- }
- free_kernel_entry(this_entry, &sun4c_kernel_ring);
- this_entry = next_entry;
- }
- sun4c_set_context(savectx);
- local_irq_restore(flags);
-}
-
-static void sun4c_flush_tlb_mm(struct mm_struct *mm)
-{
- int new_ctx = mm->context;
-
- if (new_ctx != NO_CONTEXT) {
- struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
- unsigned long flags;
-
- local_irq_save(flags);
- if (head->next != head) {
- struct sun4c_mmu_entry *entry = head->next;
- int savectx = sun4c_get_context();
-
- sun4c_set_context(new_ctx);
- sun4c_flush_context();
- do {
- struct sun4c_mmu_entry *next = entry->next;
-
- sun4c_user_unmap(entry);
- free_user_entry(new_ctx, entry);
-
- entry = next;
- } while (entry != head);
- sun4c_set_context(savectx);
- }
- local_irq_restore(flags);
- }
-}
-
-static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
-{
- struct mm_struct *mm = vma->vm_mm;
- int new_ctx = mm->context;
-
- if (new_ctx != NO_CONTEXT) {
- struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
- struct sun4c_mmu_entry *entry;
- unsigned long flags;
-
- local_irq_save(flags);
- /* See commentary in sun4c_flush_cache_range(). */
- for (entry = head->next;
- (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
- entry = entry->next)
- ;
-
- if ((entry != head) && (entry->vaddr < end)) {
- int octx = sun4c_get_context();
-
- sun4c_set_context(new_ctx);
- do {
- struct sun4c_mmu_entry *next = entry->next;
-
- sun4c_flush_segment(entry->vaddr);
- sun4c_user_unmap(entry);
- free_user_entry(new_ctx, entry);
-
- entry = next;
- } while ((entry != head) && (entry->vaddr < end));
- sun4c_set_context(octx);
- }
- local_irq_restore(flags);
- }
-}
-
-static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
- struct mm_struct *mm = vma->vm_mm;
- int new_ctx = mm->context;
-
- if (new_ctx != NO_CONTEXT) {
- int savectx = sun4c_get_context();
- unsigned long flags;
-
- local_irq_save(flags);
- sun4c_set_context(new_ctx);
- page &= PAGE_MASK;
- sun4c_flush_page(page);
- sun4c_put_pte(page, 0);
- sun4c_set_context(savectx);
- local_irq_restore(flags);
- }
-}
-
-static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
-{
- unsigned long page_entry, pg_iobits;
-
- pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
- _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
-
- page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
- page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
- sun4c_put_pte(virt_addr, page_entry);
-}
-
-static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
- unsigned long xva, unsigned int len)
-{
- while (len != 0) {
- len -= PAGE_SIZE;
- sun4c_mapioaddr(xpa, xva);
- xva += PAGE_SIZE;
- xpa += PAGE_SIZE;
- }
-}
-
-static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
-{
- while (len != 0) {
- len -= PAGE_SIZE;
- sun4c_put_pte(virt_addr, 0);
- virt_addr += PAGE_SIZE;
- }
-}
-
-static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
-{
- struct ctx_list *ctxp;
-
- ctxp = ctx_free.next;
- if (ctxp != &ctx_free) {
- remove_from_ctx_list(ctxp);
- add_to_used_ctxlist(ctxp);
- mm->context = ctxp->ctx_number;
- ctxp->ctx_mm = mm;
- return;
- }
- ctxp = ctx_used.next;
- if (ctxp->ctx_mm == old_mm)
- ctxp = ctxp->next;
- remove_from_ctx_list(ctxp);
- add_to_used_ctxlist(ctxp);
- ctxp->ctx_mm->context = NO_CONTEXT;
- ctxp->ctx_mm = mm;
- mm->context = ctxp->ctx_number;
- sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
- ctxp->ctx_number);
-}
-
-/* Switch the current MM context. */
-static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
-{
- struct ctx_list *ctx;
- int dirty = 0;
-
- if (mm->context == NO_CONTEXT) {
- dirty = 1;
- sun4c_alloc_context(old_mm, mm);
- } else {
- /* Update the LRU ring of contexts. */
- ctx = ctx_list_pool + mm->context;
- remove_from_ctx_list(ctx);
- add_to_used_ctxlist(ctx);
- }
- if (dirty || old_mm != mm)
- sun4c_set_context(mm->context);
-}
-
-static void sun4c_destroy_context(struct mm_struct *mm)
-{
- struct ctx_list *ctx_old;
-
- if (mm->context != NO_CONTEXT) {
- sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
- ctx_old = ctx_list_pool + mm->context;
- remove_from_ctx_list(ctx_old);
- add_to_free_ctxlist(ctx_old);
- mm->context = NO_CONTEXT;
- }
-}
-
-static void sun4c_mmu_info(struct seq_file *m)
-{
- int used_user_entries, i;
-
- used_user_entries = 0;
- for (i = 0; i < num_contexts; i++)
- used_user_entries += sun4c_context_ring[i].num_entries;
-
- seq_printf(m,
- "vacsize\t\t: %d bytes\n"
- "vachwflush\t: %s\n"
- "vaclinesize\t: %d bytes\n"
- "mmuctxs\t\t: %d\n"
- "mmupsegs\t: %d\n"
- "kernelpsegs\t: %d\n"
- "kfreepsegs\t: %d\n"
- "usedpsegs\t: %d\n"
- "ufreepsegs\t: %d\n"
- "user_taken\t: %d\n"
- "max_taken\t: %d\n",
- sun4c_vacinfo.num_bytes,
- (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
- sun4c_vacinfo.linesize,
- num_contexts,
- (invalid_segment + 1),
- sun4c_kernel_ring.num_entries,
- sun4c_kfree_ring.num_entries,
- used_user_entries,
- sun4c_ufree_ring.num_entries,
- sun4c_user_taken_entries,
- max_user_taken_entries);
-}
-
-/* Nothing below here should touch the mmu hardware nor the mmu_entry
- * data structures.
- */
-
-/* First the functions which the mid-level code uses to directly
- * manipulate the software page tables. Some defines since we are
- * emulating the i386 page directory layout.
- */
-#define PGD_PRESENT 0x001
-#define PGD_RW 0x002
-#define PGD_USER 0x004
-#define PGD_ACCESSED 0x020
-#define PGD_DIRTY 0x040
-#define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
-
-static void sun4c_set_pte(pte_t *ptep, pte_t pte)
-{
- *ptep = pte;
-}
-
-static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
-{
-}
-
-static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
-{
- pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
-}
-
-static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
-{
- if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */
- pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
-}
-
-static int sun4c_pte_present(pte_t pte)
-{
- return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
-}
-static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); }
-
-static int sun4c_pmd_bad(pmd_t pmd)
-{
- return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
- (!virt_addr_valid(pmd_val(pmd))));
-}
-
-static int sun4c_pmd_present(pmd_t pmd)
-{
- return ((pmd_val(pmd) & PGD_PRESENT) != 0);
-}
-
-#if 0 /* if PMD takes one word */
-static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); }
-#else /* if pmd_t is a longish aggregate */
-static void sun4c_pmd_clear(pmd_t *pmdp) {
- memset((void *)pmdp, 0, sizeof(pmd_t));
-}
-#endif
-
-static int sun4c_pgd_none(pgd_t pgd) { return 0; }
-static int sun4c_pgd_bad(pgd_t pgd) { return 0; }
-static int sun4c_pgd_present(pgd_t pgd) { return 1; }
-static void sun4c_pgd_clear(pgd_t * pgdp) { }
-
-/*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
- */
-static pte_t sun4c_pte_mkwrite(pte_t pte)
-{
- pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
- if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
- pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
- return pte;
-}
-
-static pte_t sun4c_pte_mkdirty(pte_t pte)
-{
- pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
- if (pte_val(pte) & _SUN4C_PAGE_WRITE)
- pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
- return pte;
-}
-
-static pte_t sun4c_pte_mkyoung(pte_t pte)
-{
- pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
- if (pte_val(pte) & _SUN4C_PAGE_READ)
- pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
- return pte;
-}
-
-/*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- */
-static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
-{
- return __pte(page_to_pfn(page) | pgprot_val(pgprot));
-}
-
-static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
-{
- return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
-}
-
-static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
-{
- return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
-}
-
-static unsigned long sun4c_pte_pfn(pte_t pte)
-{
- return pte_val(pte) & SUN4C_PFN_MASK;
-}
-
-static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
-{
- return __pte(pgoff | _SUN4C_PAGE_FILE);
-}
-
-static unsigned long sun4c_pte_to_pgoff(pte_t pte)
-{
- return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
-}
-
-
-static inline unsigned long sun4c_pmd_page_v(pmd_t pmd)
-{
- return (pmd_val(pmd) & PAGE_MASK);
-}
-
-static struct page *sun4c_pmd_page(pmd_t pmd)
-{
- return virt_to_page(sun4c_pmd_page_v(pmd));
-}
-
-static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
-
-/* to find an entry in a page-table-directory */
-static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
-{
- return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
-}
-
-/* Find an entry in the second-level page table.. */
-static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
-{
- return (pmd_t *) dir;
-}
-
-/* Find an entry in the third-level page table.. */
-pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
-{
- return (pte_t *) sun4c_pmd_page_v(*dir) +
- ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
-}
-
-static unsigned long sun4c_swp_type(swp_entry_t entry)
-{
- return (entry.val & SUN4C_SWP_TYPE_MASK);
-}
-
-static unsigned long sun4c_swp_offset(swp_entry_t entry)
-{
- return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
-}
-
-static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
-{
- return (swp_entry_t) {
- (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
- | (type & SUN4C_SWP_TYPE_MASK) };
-}
-
-static void sun4c_free_pte_slow(pte_t *pte)
-{
- free_page((unsigned long)pte);
-}
-
-static void sun4c_free_pgd_slow(pgd_t *pgd)
-{
- free_page((unsigned long)pgd);
-}
-
-static pgd_t *sun4c_get_pgd_fast(void)
-{
- unsigned long *ret;
-
- if ((ret = pgd_quicklist) != NULL) {
- pgd_quicklist = (unsigned long *)(*ret);
- ret[0] = ret[1];
- pgtable_cache_size--;
- } else {
- pgd_t *init;
-
- ret = (unsigned long *)__get_free_page(GFP_KERNEL);
- memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
- init = sun4c_pgd_offset(&init_mm, 0);
- memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
- (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
- }
- return (pgd_t *)ret;
-}
-
-static void sun4c_free_pgd_fast(pgd_t *pgd)
-{
- *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
- pgd_quicklist = (unsigned long *) pgd;
- pgtable_cache_size++;
-}
-
-
-static inline pte_t *
-sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
-{
- unsigned long *ret;
-
- if ((ret = (unsigned long *)pte_quicklist) != NULL) {
- pte_quicklist = (unsigned long *)(*ret);
- ret[0] = ret[1];
- pgtable_cache_size--;
- }
- return (pte_t *)ret;
-}
-
-static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
-{
- pte_t *pte;
-
- if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
- return pte;
-
- pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
- return pte;
-}
-
-static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
-{
- pte_t *pte;
- struct page *page;
-
- pte = sun4c_pte_alloc_one_kernel(mm, address);
- if (pte == NULL)
- return NULL;
- page = virt_to_page(pte);
- pgtable_page_ctor(page);
- return page;
-}
-
-static inline void sun4c_free_pte_fast(pte_t *pte)
-{
- *(unsigned long *)pte = (unsigned long) pte_quicklist;
- pte_quicklist = (unsigned long *) pte;
- pgtable_cache_size++;
-}
-
-static void sun4c_pte_free(pgtable_t pte)
-{
- pgtable_page_dtor(pte);
- sun4c_free_pte_fast(page_address(pte));
-}
-
-/*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
-static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
-{
- BUG();
- return NULL;
-}
-
-static void sun4c_free_pmd_fast(pmd_t * pmd) { }
-
-static void sun4c_check_pgt_cache(int low, int high)
-{
- if (pgtable_cache_size > high) {
- do {
- if (pgd_quicklist)
- sun4c_free_pgd_slow(sun4c_get_pgd_fast());
- if (pte_quicklist)
- sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
- } while (pgtable_cache_size > low);
- }
-}
-
-/* An experiment, turn off by default for now... -DaveM */
-#define SUN4C_PRELOAD_PSEG
-
-void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
-{
- unsigned long flags;
- int pseg;
-
- if (vma->vm_mm->context == NO_CONTEXT)
- return;
-
- local_irq_save(flags);
- address &= PAGE_MASK;
- if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
- struct sun4c_mmu_entry *entry = sun4c_user_strategy();
- struct mm_struct *mm = vma->vm_mm;
- unsigned long start, end;
-
- entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
- entry->ctx = mm->context;
- add_ring_ordered(sun4c_context_ring + mm->context, entry);
- sun4c_put_segmap(entry->vaddr, entry->pseg);
- end = start + SUN4C_REAL_PGDIR_SIZE;
- while (start < end) {
-#ifdef SUN4C_PRELOAD_PSEG
- pgd_t *pgdp = sun4c_pgd_offset(mm, start);
- pte_t *ptep;
-
- if (!pgdp)
- goto no_mapping;
- ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
- if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
- goto no_mapping;
- sun4c_put_pte(start, pte_val(*ptep));
- goto next;
-
- no_mapping:
-#endif
- sun4c_put_pte(start, 0);
-#ifdef SUN4C_PRELOAD_PSEG
- next:
-#endif
- start += PAGE_SIZE;
- }
-#ifndef SUN4C_PRELOAD_PSEG
- sun4c_put_pte(address, pte_val(*ptep));
-#endif
- local_irq_restore(flags);
- return;
- } else {
- struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
-
- remove_lru(entry);
- add_lru(entry);
- }
-
- sun4c_put_pte(address, pte_val(*ptep));
- local_irq_restore(flags);
-}
-
-extern void sparc_context_init(int);
-extern unsigned long bootmem_init(unsigned long *pages_avail);
-extern unsigned long last_valid_pfn;
-
-void __init sun4c_paging_init(void)
-{
- int i, cnt;
- unsigned long kernel_end, vaddr;
- extern struct resource sparc_iomap;
- unsigned long end_pfn, pages_avail;
-
- kernel_end = (unsigned long) &_end;
- kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
-
- pages_avail = 0;
- last_valid_pfn = bootmem_init(&pages_avail);
- end_pfn = last_valid_pfn;
-
- sun4c_probe_mmu();
- invalid_segment = (num_segmaps - 1);
- sun4c_init_mmu_entry_pool();
- sun4c_init_rings();
- sun4c_init_map_kernelprom(kernel_end);
- sun4c_init_clean_mmu(kernel_end);
- sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
- sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
- sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
- sun4c_init_lock_areas();
- sun4c_init_fill_user_ring();
-
- sun4c_set_context(0);
- memset(swapper_pg_dir, 0, PAGE_SIZE);
- memset(pg0, 0, PAGE_SIZE);
- memset(pg1, 0, PAGE_SIZE);
- memset(pg2, 0, PAGE_SIZE);
- memset(pg3, 0, PAGE_SIZE);
-
- /* Save work later. */
- vaddr = VMALLOC_START;
- swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
- vaddr += SUN4C_PGDIR_SIZE;
- swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
- vaddr += SUN4C_PGDIR_SIZE;
- swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
- vaddr += SUN4C_PGDIR_SIZE;
- swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
- sun4c_init_ss2_cache_bug();
- sparc_context_init(num_contexts);
-
- {
- unsigned long zones_size[MAX_NR_ZONES];
- unsigned long zholes_size[MAX_NR_ZONES];
- unsigned long npages;
- int znum;
-
- for (znum = 0; znum < MAX_NR_ZONES; znum++)
- zones_size[znum] = zholes_size[znum] = 0;
-
- npages = max_low_pfn - pfn_base;
-
- zones_size[ZONE_DMA] = npages;
- zholes_size[ZONE_DMA] = npages - pages_avail;
-
- npages = highend_pfn - max_low_pfn;
- zones_size[ZONE_HIGHMEM] = npages;
- zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
-
- free_area_init_node(0, zones_size, pfn_base, zholes_size);
- }
-
- cnt = 0;
- for (i = 0; i < num_segmaps; i++)
- if (mmu_entry_pool[i].locked)
- cnt++;
-
- max_user_taken_entries = num_segmaps - cnt - 40 - 1;
-
- printk("SUN4C: %d mmu entries for the kernel\n", cnt);
-}
-
-static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
-{
- prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
-
- return prot;
-}
-
-/* Load up routines and constants for sun4c mmu */
-void __init ld_mmu_sun4c(void)
-{
- extern void ___xchg32_sun4c(void);
-
- printk("Loading sun4c MMU routines\n");
-
- /* First the constants */
- BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
- BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
- BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
-
- BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
- BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
- BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
-
- BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
- PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
- BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
- BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
- BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
- page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
-
- /* Functions */
- BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
-
- if (sun4c_vacinfo.do_hwflushes) {
- BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
- } else {
- BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
- }
-
- BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
-
- BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
-
- BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
-#if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
- BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
-#else
- BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
-#endif
- BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
-
- BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
-
- BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
- BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
- BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
- BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
-
- BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
- BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
- BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
- BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
- BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
- BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
- BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
- BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
- BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
- BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
- BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(alloc_thread_info_node, sun4c_alloc_thread_info_node, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
-
- BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
-
- /* These should _never_ get called with two level tables. */
- BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
- BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
-}
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff