From ff6e8c0d5e47f0ceeebde86ec2f5919dbd5beb67 Mon Sep 17 00:00:00 2001 From: Zachary Amsden Date: Fri, 6 Jan 2006 00:11:50 -0800 Subject: [PATCH] [PATCH] x86: Cr4 is valid on some 486s So some 486 processors do have CR4 register. Allow them to present it in register dumps by using the old fault technique rather than testing processor family. Thanks to Maciej for noticing this. Signed-off-by: Zachary Amsden Cc: "Seth, Rohit" Cc: Stephen Rothwell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/process.c | 4 +--- include/asm-i386/system.h | 13 +++++++++++++ 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c index 2333aead0563..6081a10d3416 100644 --- a/arch/i386/kernel/process.c +++ b/arch/i386/kernel/process.c @@ -308,9 +308,7 @@ void show_regs(struct pt_regs * regs) cr0 = read_cr0(); cr2 = read_cr2(); cr3 = read_cr3(); - if (current_cpu_data.x86 > 4) { - cr4 = read_cr4(); - } + cr4 = read_cr4_safe(); printk("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n", cr0, cr2, cr3, cr4); show_trace(NULL, ®s->esp); } diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h index 772f85da1206..88b4d5c6f37a 100644 --- a/include/asm-i386/system.h +++ b/include/asm-i386/system.h @@ -140,6 +140,19 @@ static inline unsigned long _get_base(char * addr) :"=r" (__dummy)); \ __dummy; \ }) + +#define read_cr4_safe() ({ \ + unsigned int __dummy; \ + /* This could fault if %cr4 does not exist */ \ + __asm__("1: movl %%cr4, %0 \n" \ + "2: \n" \ + ".section __ex_table,\"a\" \n" \ + ".long 1b,2b \n" \ + ".previous \n" \ + : "=r" (__dummy): "0" (0)); \ + __dummy; \ +}) + #define write_cr4(x) \ __asm__ __volatile__("movl %0,%%cr4": :"r" (x)); #define stts() write_cr0(8 | read_cr0()) -- 2.20.1