#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/e820.h>
+#include <asm/proto.h>
#include <asm/setup.h>
+#include <asm/trampoline.h>
struct e820map e820;
pci_mem_start, gapstart, gapsize);
}
+
+/*
+ * Early reserved memory areas.
+ */
+#define MAX_EARLY_RES 20
+
+struct early_res {
+ u64 start, end;
+ char name[16];
+};
+static struct early_res early_res[MAX_EARLY_RES] __initdata = {
+ { 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
+#if defined(CONFIG_X86_64) && defined(CONFIG_X86_TRAMPOLINE)
+ { TRAMPOLINE_BASE, TRAMPOLINE_BASE + 2 * PAGE_SIZE, "TRAMPOLINE" },
+#endif
+#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
+ /*
+ * But first pinch a few for the stack/trampoline stuff
+ * FIXME: Don't need the extra page at 4K, but need to fix
+ * trampoline before removing it. (see the GDT stuff)
+ */
+ { PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE" },
+ /*
+ * Has to be in very low memory so we can execute
+ * real-mode AP code.
+ */
+ { TRAMPOLINE_BASE, TRAMPOLINE_BASE + PAGE_SIZE, "TRAMPOLINE" },
+#endif
+ {}
+};
+
+void __init reserve_early(u64 start, u64 end, char *name)
+{
+ int i;
+ struct early_res *r;
+ for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
+ r = &early_res[i];
+ if (end > r->start && start < r->end)
+ panic("Overlapping early reservations %llx-%llx %s to %llx-%llx %s\n",
+ start, end - 1, name?name:"", r->start,
+ r->end - 1, r->name);
+ }
+ if (i >= MAX_EARLY_RES)
+ panic("Too many early reservations");
+ r = &early_res[i];
+ r->start = start;
+ r->end = end;
+ if (name)
+ strncpy(r->name, name, sizeof(r->name) - 1);
+}
+
+void __init free_early(u64 start, u64 end)
+{
+ struct early_res *r;
+ int i, j;
+
+ for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
+ r = &early_res[i];
+ if (start == r->start && end == r->end)
+ break;
+ }
+ if (i >= MAX_EARLY_RES || !early_res[i].end)
+ panic("free_early on not reserved area: %llx-%llx!",
+ start, end);
+
+ for (j = i + 1; j < MAX_EARLY_RES && early_res[j].end; j++)
+ ;
+
+ memmove(&early_res[i], &early_res[i + 1],
+ (j - 1 - i) * sizeof(struct early_res));
+
+ early_res[j - 1].end = 0;
+}
+
+void __init early_res_to_bootmem(u64 start, u64 end)
+{
+ int i;
+ u64 final_start, final_end;
+ for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
+ struct early_res *r = &early_res[i];
+ final_start = max(start, r->start);
+ final_end = min(end, r->end);
+ if (final_start >= final_end)
+ continue;
+ printk(KERN_INFO " early res: %d [%llx-%llx] %s\n", i,
+ final_start, final_end - 1, r->name);
+#ifdef CONFIG_X86_64
+ reserve_bootmem_generic(final_start, final_end - final_start);
+#else
+ reserve_bootmem(final_start, final_end - final_start,
+ BOOTMEM_DEFAULT);
+#endif
+ }
+}
+
+/* Check for already reserved areas */
+static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
+{
+ int i;
+ u64 addr = *addrp, last;
+ int changed = 0;
+again:
+ last = addr + size;
+ for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
+ struct early_res *r = &early_res[i];
+ if (last >= r->start && addr < r->end) {
+ *addrp = addr = round_up(r->end, align);
+ changed = 1;
+ goto again;
+ }
+ }
+ return changed;
+}
+
+/* Check for already reserved areas */
+static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
+{
+ int i;
+ u64 addr = *addrp, last;
+ u64 size = *sizep;
+ int changed = 0;
+again:
+ last = addr + size;
+ for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
+ struct early_res *r = &early_res[i];
+ if (last > r->start && addr < r->start) {
+ size = r->start - addr;
+ changed = 1;
+ goto again;
+ }
+ if (last > r->end && addr < r->end) {
+ addr = round_up(r->end, align);
+ size = last - addr;
+ changed = 1;
+ goto again;
+ }
+ if (last <= r->end && addr >= r->start) {
+ (*sizep)++;
+ return 0;
+ }
+ }
+ if (changed) {
+ *addrp = addr;
+ *sizep = size;
+ }
+ return changed;
+}
+
+/*
+ * Find a free area with specified alignment in a specific range.
+ */
+u64 __init find_e820_area(u64 start, u64 end, u64 size, u64 align)
+{
+ int i;
+
+ for (i = 0; i < e820.nr_map; i++) {
+ struct e820entry *ei = &e820.map[i];
+ u64 addr, last;
+ u64 ei_last;
+
+ if (ei->type != E820_RAM)
+ continue;
+ addr = round_up(ei->addr, align);
+ ei_last = ei->addr + ei->size;
+ if (addr < start)
+ addr = round_up(start, align);
+ if (addr >= ei_last)
+ continue;
+ while (bad_addr(&addr, size, align) && addr+size <= ei_last)
+ ;
+ last = addr + size;
+ if (last > ei_last)
+ continue;
+ if (last > end)
+ continue;
+ return addr;
+ }
+ return -1ULL;
+}
+
+/*
+ * Find next free range after *start
+ */
+u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
+{
+ int i;
+
+ for (i = 0; i < e820.nr_map; i++) {
+ struct e820entry *ei = &e820.map[i];
+ u64 addr, last;
+ u64 ei_last;
+
+ if (ei->type != E820_RAM)
+ continue;
+ addr = round_up(ei->addr, align);
+ ei_last = ei->addr + ei->size;
+ if (addr < start)
+ addr = round_up(start, align);
+ if (addr >= ei_last)
+ continue;
+ *sizep = ei_last - addr;
+ while (bad_addr_size(&addr, sizep, align) &&
+ addr + *sizep <= ei_last)
+ ;
+ last = addr + *sizep;
+ if (last > ei_last)
+ continue;
+ return addr;
+ }
+ return -1UL;
+
+}
*/
static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
-/*
- * Early reserved memory areas.
- */
-#define MAX_EARLY_RES 20
-
-struct early_res {
- unsigned long start, end;
- char name[16];
-};
-static struct early_res early_res[MAX_EARLY_RES] __initdata = {
- { 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
-#ifdef CONFIG_X86_TRAMPOLINE
- { TRAMPOLINE_BASE, TRAMPOLINE_BASE + 2 * PAGE_SIZE, "TRAMPOLINE" },
-#endif
- {}
-};
-
-void __init reserve_early(unsigned long start, unsigned long end, char *name)
-{
- int i;
- struct early_res *r;
- for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
- r = &early_res[i];
- if (end > r->start && start < r->end)
- panic("Overlapping early reservations %lx-%lx %s to %lx-%lx %s\n",
- start, end - 1, name?name:"", r->start, r->end - 1, r->name);
- }
- if (i >= MAX_EARLY_RES)
- panic("Too many early reservations");
- r = &early_res[i];
- r->start = start;
- r->end = end;
- if (name)
- strncpy(r->name, name, sizeof(r->name) - 1);
-}
-
-void __init free_early(unsigned long start, unsigned long end)
-{
- struct early_res *r;
- int i, j;
-
- for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
- r = &early_res[i];
- if (start == r->start && end == r->end)
- break;
- }
- if (i >= MAX_EARLY_RES || !early_res[i].end)
- panic("free_early on not reserved area: %lx-%lx!", start, end);
-
- for (j = i + 1; j < MAX_EARLY_RES && early_res[j].end; j++)
- ;
-
- memmove(&early_res[i], &early_res[i + 1],
- (j - 1 - i) * sizeof(struct early_res));
-
- early_res[j - 1].end = 0;
-}
-
-void __init early_res_to_bootmem(unsigned long start, unsigned long end)
-{
- int i;
- unsigned long final_start, final_end;
- for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
- struct early_res *r = &early_res[i];
- final_start = max(start, r->start);
- final_end = min(end, r->end);
- if (final_start >= final_end)
- continue;
- printk(KERN_INFO " early res: %d [%lx-%lx] %s\n", i,
- final_start, final_end - 1, r->name);
- reserve_bootmem_generic(final_start, final_end - final_start);
- }
-}
-
-/* Check for already reserved areas */
-static inline int __init
-bad_addr(unsigned long *addrp, unsigned long size, unsigned long align)
-{
- int i;
- unsigned long addr = *addrp, last;
- int changed = 0;
-again:
- last = addr + size;
- for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
- struct early_res *r = &early_res[i];
- if (last >= r->start && addr < r->end) {
- *addrp = addr = round_up(r->end, align);
- changed = 1;
- goto again;
- }
- }
- return changed;
-}
-
-/* Check for already reserved areas */
-static inline int __init
-bad_addr_size(unsigned long *addrp, unsigned long *sizep, unsigned long align)
-{
- int i;
- unsigned long addr = *addrp, last;
- unsigned long size = *sizep;
- int changed = 0;
-again:
- last = addr + size;
- for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
- struct early_res *r = &early_res[i];
- if (last > r->start && addr < r->start) {
- size = r->start - addr;
- changed = 1;
- goto again;
- }
- if (last > r->end && addr < r->end) {
- addr = round_up(r->end, align);
- size = last - addr;
- changed = 1;
- goto again;
- }
- if (last <= r->end && addr >= r->start) {
- (*sizep)++;
- return 0;
- }
- }
- if (changed) {
- *addrp = addr;
- *sizep = size;
- }
- return changed;
-}
-
-/*
- * Find a free area with specified alignment in a specific range.
- */
-unsigned long __init find_e820_area(unsigned long start, unsigned long end,
- unsigned long size, unsigned long align)
-{
- int i;
-
- for (i = 0; i < e820.nr_map; i++) {
- struct e820entry *ei = &e820.map[i];
- unsigned long addr, last;
- unsigned long ei_last;
-
- if (ei->type != E820_RAM)
- continue;
- addr = round_up(ei->addr, align);
- ei_last = ei->addr + ei->size;
- if (addr < start)
- addr = round_up(start, align);
- if (addr >= ei_last)
- continue;
- while (bad_addr(&addr, size, align) && addr+size <= ei_last)
- ;
- last = addr + size;
- if (last > ei_last)
- continue;
- if (last > end)
- continue;
- return addr;
- }
- return -1UL;
-}
-
-/*
- * Find next free range after *start
- */
-unsigned long __init find_e820_area_size(unsigned long start,
- unsigned long *sizep,
- unsigned long align)
-{
- int i;
-
- for (i = 0; i < e820.nr_map; i++) {
- struct e820entry *ei = &e820.map[i];
- unsigned long addr, last;
- unsigned long ei_last;
-
- if (ei->type != E820_RAM)
- continue;
- addr = round_up(ei->addr, align);
- ei_last = ei->addr + ei->size;
- if (addr < start)
- addr = round_up(start, align);
- if (addr >= ei_last)
- continue;
- *sizep = ei_last - addr;
- while (bad_addr_size(&addr, sizep, align) &&
- addr + *sizep <= ei_last)
- ;
- last = addr + *sizep;
- if (last > ei_last)
- continue;
- return addr;
- }
- return -1UL;
-
-}
/*
* Find the highest page frame number we have available
*/
#include <linux/init.h>
#include <linux/start_kernel.h>
+#include <asm/setup.h>
+#include <asm/sections.h>
+#include <asm/e820.h>
+#include <asm/bios_ebda.h>
+
+#define BIOS_LOWMEM_KILOBYTES 0x413
+
+/*
+ * The BIOS places the EBDA/XBDA at the top of conventional
+ * memory, and usually decreases the reported amount of
+ * conventional memory (int 0x12) too. This also contains a
+ * workaround for Dell systems that neglect to reserve EBDA.
+ * The same workaround also avoids a problem with the AMD768MPX
+ * chipset: reserve a page before VGA to prevent PCI prefetch
+ * into it (errata #56). Usually the page is reserved anyways,
+ * unless you have no PS/2 mouse plugged in.
+ */
+static void __init reserve_ebda_region(void)
+{
+ unsigned int lowmem, ebda_addr;
+
+ /* To determine the position of the EBDA and the */
+ /* end of conventional memory, we need to look at */
+ /* the BIOS data area. In a paravirtual environment */
+ /* that area is absent. We'll just have to assume */
+ /* that the paravirt case can handle memory setup */
+ /* correctly, without our help. */
+ if (paravirt_enabled())
+ return;
+
+ /* end of low (conventional) memory */
+ lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
+ lowmem <<= 10;
+
+ /* start of EBDA area */
+ ebda_addr = get_bios_ebda();
+
+ /* Fixup: bios puts an EBDA in the top 64K segment */
+ /* of conventional memory, but does not adjust lowmem. */
+ if ((lowmem - ebda_addr) <= 0x10000)
+ lowmem = ebda_addr;
+
+ /* Fixup: bios does not report an EBDA at all. */
+ /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
+ if ((ebda_addr == 0) && (lowmem >= 0x9f000))
+ lowmem = 0x9f000;
+
+ /* Paranoia: should never happen, but... */
+ if ((lowmem == 0) || (lowmem >= 0x100000))
+ lowmem = 0x9f000;
+
+ /* reserve all memory between lowmem and the 1MB mark */
+ reserve_early(lowmem, 0x100000, "BIOS reserved");
+}
+
void __init i386_start_kernel(void)
{
+ reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ /* Reserve INITRD */
+ if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
+ u64 ramdisk_image = boot_params.hdr.ramdisk_image;
+ u64 ramdisk_size = boot_params.hdr.ramdisk_size;
+ u64 ramdisk_end = ramdisk_image + ramdisk_size;
+ reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
+ }
+#endif
+ reserve_early(__pa_symbol(&_end), init_pg_tables_end, "INIT_PG_TABLE");
+
+ reserve_ebda_region();
+
+ /*
+ * At this point everything still needed from the boot loader
+ * or BIOS or kernel text should be early reserved or marked not
+ * RAM in e820. All other memory is free game.
+ */
+
start_kernel();
}
return max_low_pfn;
}
-#define BIOS_LOWMEM_KILOBYTES 0x413
-
-/*
- * The BIOS places the EBDA/XBDA at the top of conventional
- * memory, and usually decreases the reported amount of
- * conventional memory (int 0x12) too. This also contains a
- * workaround for Dell systems that neglect to reserve EBDA.
- * The same workaround also avoids a problem with the AMD768MPX
- * chipset: reserve a page before VGA to prevent PCI prefetch
- * into it (errata #56). Usually the page is reserved anyways,
- * unless you have no PS/2 mouse plugged in.
- */
-static void __init reserve_ebda_region(void)
-{
- unsigned int lowmem, ebda_addr;
-
- /* To determine the position of the EBDA and the */
- /* end of conventional memory, we need to look at */
- /* the BIOS data area. In a paravirtual environment */
- /* that area is absent. We'll just have to assume */
- /* that the paravirt case can handle memory setup */
- /* correctly, without our help. */
- if (paravirt_enabled())
- return;
-
- /* end of low (conventional) memory */
- lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
- lowmem <<= 10;
-
- /* start of EBDA area */
- ebda_addr = get_bios_ebda();
-
- /* Fixup: bios puts an EBDA in the top 64K segment */
- /* of conventional memory, but does not adjust lowmem. */
- if ((lowmem - ebda_addr) <= 0x10000)
- lowmem = ebda_addr;
-
- /* Fixup: bios does not report an EBDA at all. */
- /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
- if ((ebda_addr == 0) && (lowmem >= 0x9f000))
- lowmem = 0x9f000;
-
- /* Paranoia: should never happen, but... */
- if ((lowmem == 0) || (lowmem >= 0x100000))
- lowmem = 0x9f000;
-
- /* reserve all memory between lowmem and the 1MB mark */
- reserve_bootmem(lowmem, 0x100000 - lowmem, BOOTMEM_DEFAULT);
-}
-
#ifndef CONFIG_NEED_MULTIPLE_NODES
static void __init setup_bootmem_allocator(void);
static unsigned long __init setup_memory(void)
unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
unsigned long ramdisk_here;
- initrd_start = 0;
-
if (!boot_params.hdr.type_of_loader ||
!ramdisk_image || !ramdisk_size)
return; /* No initrd provided by bootloader */
+ initrd_start = 0;
+
if (ramdisk_end < ramdisk_image) {
+ free_bootmem(ramdisk_image, ramdisk_size);
printk(KERN_ERR "initrd wraps around end of memory, "
"disabling initrd\n");
return;
}
if (ramdisk_size >= end_of_lowmem/2) {
+ free_bootmem(ramdisk_image, ramdisk_size);
printk(KERN_ERR "initrd too large to handle, "
"disabling initrd\n");
return;
}
+
if (ramdisk_end <= end_of_lowmem) {
/* All in lowmem, easy case */
- reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
+ /*
+ * don't need to reserve again, already reserved early
+ * in i386_start_kernel, and early_res_to_bootmem
+ * convert that to reserved in bootmem
+ */
initrd_start = ramdisk_image + PAGE_OFFSET;
initrd_end = initrd_start+ramdisk_size;
return;
p = (char *)__va(ramdisk_image);
memcpy(q, p, clen);
q += clen;
+ /* need to free these low pages...*/
+ free_bootmem(ramdisk_image, clen);
ramdisk_image += clen;
ramdisk_size -= clen;
}
ramdisk_image += clen;
ramdisk_size -= clen;
}
+ /* high pages is not converted by early_res_to_bootmem */
}
#endif /* CONFIG_BLK_DEV_INITRD */
void __init setup_bootmem_allocator(void)
{
- unsigned long bootmap_size;
+ unsigned long bootmap_size, bootmap;
/*
* Initialize the boot-time allocator (with low memory only):
*/
- bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
-
+ bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT;
+ bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT,
+ max_low_pfn<<PAGE_SHIFT, bootmap_size,
+ PAGE_SIZE);
+ if (bootmap == -1L)
+ panic("Cannot find bootmem map of size %ld\n", bootmap_size);
+ bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, max_low_pfn);
register_bootmem_low_pages(max_low_pfn);
+ early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
+ reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
- /*
- * Reserve the bootmem bitmap itself as well. We do this in two
- * steps (first step was init_bootmem()) because this catches
- * the (very unlikely) case of us accidentally initializing the
- * bootmem allocator with an invalid RAM area.
- */
- reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
- bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
- BOOTMEM_DEFAULT);
-
- /*
- * reserve physical page 0 - it's a special BIOS page on many boxes,
- * enabling clean reboots, SMP operation, laptop functions.
- */
- reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
-
- /* reserve EBDA region */
- reserve_ebda_region();
-
-#ifdef CONFIG_SMP
- /*
- * But first pinch a few for the stack/trampoline stuff
- * FIXME: Don't need the extra page at 4K, but need to fix
- * trampoline before removing it. (see the GDT stuff)
- */
- reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
-#endif
#ifdef CONFIG_ACPI_SLEEP
/*
* Reserve low memory region for sleep support.
* not to exceed the 8Mb limit.
*/
-#ifdef CONFIG_SMP
- smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
-#endif
paging_init();
/*
return c->llc_shared_map;
}
-#ifdef CONFIG_X86_32
-/*
- * We are called very early to get the low memory for the
- * SMP bootup trampoline page.
- */
-void __init smp_alloc_memory(void)
-{
- trampoline_base = alloc_bootmem_low_pages(PAGE_SIZE);
- /*
- * Has to be in very low memory so we can execute
- * real-mode AP code.
- */
- if (__pa(trampoline_base) >= 0x9F000)
- BUG();
-}
-#endif
-
static void impress_friends(void)
{
int cpu;
#include <asm/trampoline.h>
-/* ready for x86_64, no harm for x86, since it will overwrite after alloc */
+/* ready for x86_64 and x86 */
unsigned char *trampoline_base = __va(TRAMPOLINE_BASE);
/*
on_each_cpu(do_flush_tlb_all, 0, 1, 1);
}
-/* used to set up the trampoline for other CPUs when the memory manager
- * is sorted out */
-void __init smp_alloc_memory(void)
-{
- trampoline_base = alloc_bootmem_low_pages(PAGE_SIZE);
- if (__pa(trampoline_base) >= 0x93000)
- BUG();
-}
-
/* send a reschedule CPI to one CPU by physical CPU number*/
static void voyager_smp_send_reschedule(int cpu)
{
extern void update_e820(void);
extern void e820_setup_gap(void);
+extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
+extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
+extern void reserve_early(u64 start, u64 end, char *name);
+extern void free_early(u64 start, u64 end);
+extern void early_res_to_bootmem(u64 start, u64 end);
+
#endif /* __ASSEMBLY__ */
#define ISA_START_ADDRESS 0xa0000
#include <linux/ioport.h>
#ifndef __ASSEMBLY__
-extern unsigned long find_e820_area(unsigned long start, unsigned long end,
- unsigned long size, unsigned long align);
-extern unsigned long find_e820_area_size(unsigned long start,
- unsigned long *sizep,
- unsigned long align);
extern void setup_memory_region(void);
extern void contig_e820_setup(void);
extern unsigned long e820_end_of_ram(void);
extern void finish_e820_parsing(void);
-extern void reserve_early(unsigned long start, unsigned long end, char *name);
-extern void free_early(unsigned long start, unsigned long end);
-extern void early_res_to_bootmem(unsigned long start, unsigned long end);
-
#endif/*!__ASSEMBLY__*/
#endif/*__E820_HEADER*/
extern void cpu_uninit(void);
#endif
-extern void smp_alloc_memory(void);
extern void lock_ipi_call_lock(void);
extern void unlock_ipi_call_lock(void);
#endif /* __ASSEMBLY__ */
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff