From 61c4628b538608c1a85211ed8438136adfeb9a95 Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Mon, 10 Mar 2008 15:28:04 -0700 Subject: x86, fpu: split FPU state from task struct - v5 Split the FPU save area from the task struct. This allows easy migration of FPU context, and it's generally cleaner. It also allows the following two optimizations: 1) only allocate when the application actually uses FPU, so in the first lazy FPU trap. This could save memory for non-fpu using apps. Next patch does this lazy allocation. 2) allocate the right size for the actual cpu rather than 512 bytes always. Patches enabling xsave/xrstor support (coming shortly) will take advantage of this. Signed-off-by: Suresh Siddha Signed-off-by: Arjan van de Ven Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/math-emu/fpu_entry.c | 4 ++-- arch/x86/math-emu/fpu_system.h | 26 +++++++++++++------------- arch/x86/math-emu/reg_ld_str.c | 4 ++-- 3 files changed, 17 insertions(+), 17 deletions(-) (limited to 'arch/x86/math-emu') diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c index 4bab3b14539..6e38d877ea7 100644 --- a/arch/x86/math-emu/fpu_entry.c +++ b/arch/x86/math-emu/fpu_entry.c @@ -678,7 +678,7 @@ int fpregs_soft_set(struct task_struct *target, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) { - struct i387_soft_struct *s387 = &target->thread.i387.soft; + struct i387_soft_struct *s387 = &target->thread.xstate->soft; void *space = s387->st_space; int ret; int offset, other, i, tags, regnr, tag, newtop; @@ -730,7 +730,7 @@ int fpregs_soft_get(struct task_struct *target, unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf) { - struct i387_soft_struct *s387 = &target->thread.i387.soft; + struct i387_soft_struct *s387 = &target->thread.xstate->soft; const void *space = s387->st_space; int ret; int offset = (S387->ftop & 7) * 10, other = 80 - offset; diff --git a/arch/x86/math-emu/fpu_system.h b/arch/x86/math-emu/fpu_system.h index a3ae28c49dd..13488fa153e 100644 --- a/arch/x86/math-emu/fpu_system.h +++ b/arch/x86/math-emu/fpu_system.h @@ -35,8 +35,8 @@ #define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \ == (1 << 10)) -#define I387 (current->thread.i387) -#define FPU_info (I387.soft.info) +#define I387 (current->thread.xstate) +#define FPU_info (I387->soft.info) #define FPU_CS (*(unsigned short *) &(FPU_info->___cs)) #define FPU_SS (*(unsigned short *) &(FPU_info->___ss)) @@ -46,25 +46,25 @@ #define FPU_EIP (FPU_info->___eip) #define FPU_ORIG_EIP (FPU_info->___orig_eip) -#define FPU_lookahead (I387.soft.lookahead) +#define FPU_lookahead (I387->soft.lookahead) /* nz if ip_offset and cs_selector are not to be set for the current instruction. */ -#define no_ip_update (*(u_char *)&(I387.soft.no_update)) -#define FPU_rm (*(u_char *)&(I387.soft.rm)) +#define no_ip_update (*(u_char *)&(I387->soft.no_update)) +#define FPU_rm (*(u_char *)&(I387->soft.rm)) /* Number of bytes of data which can be legally accessed by the current instruction. This only needs to hold a number <= 108, so a byte will do. */ -#define access_limit (*(u_char *)&(I387.soft.alimit)) +#define access_limit (*(u_char *)&(I387->soft.alimit)) -#define partial_status (I387.soft.swd) -#define control_word (I387.soft.cwd) -#define fpu_tag_word (I387.soft.twd) -#define registers (I387.soft.st_space) -#define top (I387.soft.ftop) +#define partial_status (I387->soft.swd) +#define control_word (I387->soft.cwd) +#define fpu_tag_word (I387->soft.twd) +#define registers (I387->soft.st_space) +#define top (I387->soft.ftop) -#define instruction_address (*(struct address *)&I387.soft.fip) -#define operand_address (*(struct address *)&I387.soft.foo) +#define instruction_address (*(struct address *)&I387->soft.fip) +#define operand_address (*(struct address *)&I387->soft.foo) #define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \ math_abort(FPU_info,SIGSEGV) diff --git a/arch/x86/math-emu/reg_ld_str.c b/arch/x86/math-emu/reg_ld_str.c index 02af772a24d..d597fe7423c 100644 --- a/arch/x86/math-emu/reg_ld_str.c +++ b/arch/x86/math-emu/reg_ld_str.c @@ -1180,8 +1180,8 @@ u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d) control_word |= 0xffff0040; partial_status = status_word() | 0xffff0000; fpu_tag_word |= 0xffff0000; - I387.soft.fcs &= ~0xf8000000; - I387.soft.fos |= 0xffff0000; + I387->soft.fcs &= ~0xf8000000; + I387->soft.fos |= 0xffff0000; #endif /* PECULIAR_486 */ if (__copy_to_user(d, &control_word, 7 * 4)) FPU_abort; -- cgit v1.2.3-70-g09d2