From 3829ee6b1be03d5aa3005fe7d19f30088b539836 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Thu, 28 Jul 2005 21:15:48 -0700 Subject: [PATCH] [PATCH] x86_64: Small assembly improvements Save a byte here and there. Ultimatively useless, but these things always catch my eyes when reading the code so just fix them for now. Also I got at least one patch fixing of them already, which gives a good excuse. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86_64/kernel/entry.S | 10 +++++----- arch/x86_64/kernel/head.S | 16 ++++++++-------- 2 files changed, 13 insertions(+), 13 deletions(-) diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S index 28817490fdc6..0696e025dce5 100644 --- a/arch/x86_64/kernel/entry.S +++ b/arch/x86_64/kernel/entry.S @@ -76,7 +76,7 @@ .macro FAKE_STACK_FRAME child_rip /* push in order ss, rsp, eflags, cs, rip */ - xorq %rax, %rax + xorl %eax, %eax pushq %rax /* ss */ CFI_ADJUST_CFA_OFFSET 8 pushq %rax /* rsp */ @@ -423,7 +423,7 @@ ENTRY(stub_rt_sigreturn) testl $3,CS(%rdi) je 1f swapgs -1: addl $1,%gs:pda_irqcount # RED-PEN should check preempt count +1: incl %gs:pda_irqcount # RED-PEN should check preempt count movq %gs:pda_irqstackptr,%rax cmoveq %rax,%rsp pushq %rdi # save old stack @@ -436,7 +436,7 @@ ENTRY(common_interrupt) ret_from_intr: popq %rdi cli - subl $1,%gs:pda_irqcount + decl %gs:pda_irqcount #ifdef CONFIG_DEBUG_INFO movq RBP(%rdi),%rbp #endif @@ -494,7 +494,7 @@ retint_signal: sti SAVE_REST movq $-1,ORIG_RAX(%rsp) - xorq %rsi,%rsi # oldset + xorl %esi,%esi # oldset movq %rsp,%rdi # &pt_regs call do_notify_resume RESTORE_REST @@ -752,7 +752,7 @@ child_rip: movq %rsi, %rdi call *%rax # exit - xorq %rdi, %rdi + xorl %edi, %edi call do_exit /* diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S index 8d765aa77a26..98ff5eb32b9a 100644 --- a/arch/x86_64/kernel/head.S +++ b/arch/x86_64/kernel/head.S @@ -137,14 +137,14 @@ startup_64: wrmsr /* Setup cr0 */ - xorq %rax, %rax - btsq $31, %rax /* Enable paging */ - btsq $0, %rax /* Enable protected mode */ - btsq $1, %rax /* Enable MP */ - btsq $4, %rax /* Enable ET */ - btsq $5, %rax /* Enable NE */ - btsq $16, %rax /* Enable WP */ - btsq $18, %rax /* Enable AM */ +#define CR0_PM 1 /* protected mode */ +#define CR0_MP (1<<1) +#define CR0_ET (1<<4) +#define CR0_NE (1<<5) +#define CR0_WP (1<<16) +#define CR0_AM (1<<18) +#define CR0_PAGING (1<<31) + movl $CR0_PM|CR0_MP|CR0_ET|CR0_NE|CR0_WP|CR0_AM|CR0_PAGING,%eax /* Make changes effective */ movq %rax, %cr0 -- 2.30.2