+++ /dev/null
-/*
- * linux/arch/i386/kernel/i387.c
- *
- * Copyright (C) 1994 Linus Torvalds
- *
- * Pentium III FXSR, SSE support
- * General FPU state handling cleanups
- * Gareth Hughes <gareth@valinux.com>, May 2000
- */
-
-#include <linux/config.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <asm/processor.h>
-#include <asm/i387.h>
-#include <asm/math_emu.h>
-#include <asm/sigcontext.h>
-#include <asm/user.h>
-#include <asm/ptrace.h>
-#include <asm/uaccess.h>
-
-#define HAVE_HWFP 1
-
-static union i387_union empty_fpu_state;
-
-void __init boot_init_fpu(void)
-{
- memset(&empty_fpu_state, 0, sizeof(union i387_union));
-
- if (!cpu_has_fxsr) {
- empty_fpu_state.fsave.cwd = 0xffff037f;
- empty_fpu_state.fsave.swd = 0xffff0000;
- empty_fpu_state.fsave.twd = 0xffffffff;
- empty_fpu_state.fsave.fos = 0xffff0000;
- } else {
- empty_fpu_state.fxsave.cwd = 0x37f;
- if (cpu_has_xmm)
- empty_fpu_state.fxsave.mxcsr = 0x1f80;
- }
-}
-
-void load_empty_fpu(struct task_struct * tsk)
-{
- memcpy(&tsk->thread.i387, &empty_fpu_state, sizeof(union i387_union));
-}
-
-/*
- * The _current_ task is using the FPU for the first time
- * so initialize it and set the mxcsr to its default
- * value at reset if we support XMM instructions and then
- * remeber the current task has used the FPU.
- */
-void init_fpu(void)
-{
- if (cpu_has_fxsr)
- asm volatile("fxrstor %0" : : "m" (empty_fpu_state.fxsave));
- else
- __asm__("fninit");
- current->used_math = 1;
-}
-
-/*
- * FPU lazy state save handling.
- */
-
-static inline void __save_init_fpu( struct task_struct *tsk )
-{
- if ( cpu_has_fxsr ) {
- asm volatile( "fxsave %0 ; fnclex"
- : "=m" (tsk->thread.i387.fxsave) );
- } else {
- asm volatile( "fnsave %0 ; fwait"
- : "=m" (tsk->thread.i387.fsave) );
- }
- tsk->flags &= ~PF_USEDFPU;
-}
-
-void save_init_fpu( struct task_struct *tsk )
-{
- __save_init_fpu(tsk);
- stts();
-}
-
-void kernel_fpu_begin(void)
-{
- struct task_struct *tsk = current;
-
- if (tsk->flags & PF_USEDFPU) {
- __save_init_fpu(tsk);
- return;
- }
- clts();
-}
-
-void restore_fpu( struct task_struct *tsk )
-{
- if ( cpu_has_fxsr ) {
- asm volatile( "fxrstor %0"
- : : "m" (tsk->thread.i387.fxsave) );
- } else {
- asm volatile( "frstor %0"
- : : "m" (tsk->thread.i387.fsave) );
- }
-}
-
-/*
- * FPU tag word conversions.
- */
-
-static inline unsigned short twd_i387_to_fxsr( unsigned short twd )
-{
- unsigned int tmp; /* to avoid 16 bit prefixes in the code */
-
- /* Transform each pair of bits into 01 (valid) or 00 (empty) */
- tmp = ~twd;
- tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
- /* and move the valid bits to the lower byte. */
- tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
- tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
- tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
- return tmp;
-}
-
-static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave )
-{
- struct _fpxreg *st = NULL;
- unsigned long twd = (unsigned long) fxsave->twd;
- unsigned long tag;
- unsigned long ret = 0xffff0000;
- int i;
-
-#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16);
-
- for ( i = 0 ; i < 8 ; i++ ) {
- if ( twd & 0x1 ) {
- st = (struct _fpxreg *) FPREG_ADDR( fxsave, i );
-
- switch ( st->exponent & 0x7fff ) {
- case 0x7fff:
- tag = 2; /* Special */
- break;
- case 0x0000:
- if ( !st->significand[0] &&
- !st->significand[1] &&
- !st->significand[2] &&
- !st->significand[3] ) {
- tag = 1; /* Zero */
- } else {
- tag = 2; /* Special */
- }
- break;
- default:
- if ( st->significand[3] & 0x8000 ) {
- tag = 0; /* Valid */
- } else {
- tag = 2; /* Special */
- }
- break;
- }
- } else {
- tag = 3; /* Empty */
- }
- ret |= (tag << (2 * i));
- twd = twd >> 1;
- }
- return ret;
-}
-
-/*
- * FPU state interaction.
- */
-
-unsigned short get_fpu_cwd( struct task_struct *tsk )
-{
- if ( cpu_has_fxsr ) {
- return tsk->thread.i387.fxsave.cwd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.cwd;
- }
-}
-
-unsigned short get_fpu_swd( struct task_struct *tsk )
-{
- if ( cpu_has_fxsr ) {
- return tsk->thread.i387.fxsave.swd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.swd;
- }
-}
-
-unsigned short get_fpu_twd( struct task_struct *tsk )
-{
- if ( cpu_has_fxsr ) {
- return tsk->thread.i387.fxsave.twd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.twd;
- }
-}
-
-unsigned short get_fpu_mxcsr( struct task_struct *tsk )
-{
- if ( cpu_has_xmm ) {
- return tsk->thread.i387.fxsave.mxcsr;
- } else {
- return 0x1f80;
- }
-}
-
-void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd )
-{
- if ( cpu_has_fxsr ) {
- tsk->thread.i387.fxsave.cwd = cwd;
- } else {
- tsk->thread.i387.fsave.cwd = ((long)cwd | 0xffff0000);
- }
-}
-
-void set_fpu_swd( struct task_struct *tsk, unsigned short swd )
-{
- if ( cpu_has_fxsr ) {
- tsk->thread.i387.fxsave.swd = swd;
- } else {
- tsk->thread.i387.fsave.swd = ((long)swd | 0xffff0000);
- }
-}
-
-void set_fpu_twd( struct task_struct *tsk, unsigned short twd )
-{
- if ( cpu_has_fxsr ) {
- tsk->thread.i387.fxsave.twd = twd_i387_to_fxsr(twd);
- } else {
- tsk->thread.i387.fsave.twd = ((long)twd | 0xffff0000);
- }
-}
-
-void set_fpu_mxcsr( struct task_struct *tsk, unsigned short mxcsr )
-{
- if ( cpu_has_xmm ) {
- tsk->thread.i387.fxsave.mxcsr = (mxcsr & 0xffbf);
- }
-}
-
-/*
- * FXSR floating point environment conversions.
- */
-
-static inline int convert_fxsr_to_user( struct _fpstate *buf,
- struct i387_fxsave_struct *fxsave )
-{
- unsigned long env[7];
- struct _fpreg *to;
- struct _fpxreg *from;
- int i;
-
- env[0] = (unsigned long)fxsave->cwd | 0xffff0000;
- env[1] = (unsigned long)fxsave->swd | 0xffff0000;
- env[2] = twd_fxsr_to_i387(fxsave);
- env[3] = fxsave->fip;
- env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
- env[5] = fxsave->foo;
- env[6] = fxsave->fos;
-
- if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
- return 1;
-
- to = &buf->_st[0];
- from = (struct _fpxreg *) &fxsave->st_space[0];
- for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
- if ( __copy_to_user( to, from, sizeof(*to) ) )
- return 1;
- }
- return 0;
-}
-
-static inline int convert_fxsr_from_user( struct i387_fxsave_struct *fxsave,
- struct _fpstate *buf )
-{
- unsigned long env[7];
- struct _fpxreg *to;
- struct _fpreg *from;
- int i;
-
- if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
- return 1;
-
- fxsave->cwd = (unsigned short)(env[0] & 0xffff);
- fxsave->swd = (unsigned short)(env[1] & 0xffff);
- fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
- fxsave->fip = env[3];
- fxsave->fop = (unsigned short)((env[4] & 0xffff0000) >> 16);
- fxsave->fcs = (env[4] & 0xffff);
- fxsave->foo = env[5];
- fxsave->fos = env[6];
-
- to = (struct _fpxreg *) &fxsave->st_space[0];
- from = &buf->_st[0];
- for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
- if ( __copy_from_user( to, from, sizeof(*from) ) )
- return 1;
- }
- return 0;
-}
-
-/*
- * Signal frame handlers.
- */
-
-static inline int save_i387_fsave( struct _fpstate *buf )
-{
- struct task_struct *tsk = current;
-
- unlazy_fpu( tsk );
- tsk->thread.i387.fsave.status = tsk->thread.i387.fsave.swd;
- if ( __copy_to_user( buf, &tsk->thread.i387.fsave,
- sizeof(struct i387_fsave_struct) ) )
- return -1;
- return 1;
-}
-
-static inline int save_i387_fxsave( struct _fpstate *buf )
-{
- struct task_struct *tsk = current;
- int err = 0;
-
- unlazy_fpu( tsk );
-
- if ( convert_fxsr_to_user( buf, &tsk->thread.i387.fxsave ) )
- return -1;
-
- err |= __put_user( tsk->thread.i387.fxsave.swd, &buf->status );
- err |= __put_user( X86_FXSR_MAGIC, &buf->magic );
- if ( err )
- return -1;
-
- if ( __copy_to_user( &buf->_fxsr_env[0], &tsk->thread.i387.fxsave,
- sizeof(struct i387_fxsave_struct) ) )
- return -1;
- return 1;
-}
-
-int save_i387( struct _fpstate *buf )
-{
- if ( !current->used_math )
- return 0;
-
- /* This will cause a "finit" to be triggered by the next
- * attempted FPU operation by the 'current' process.
- */
- current->used_math = 0;
-
- if ( HAVE_HWFP ) {
- if ( cpu_has_fxsr ) {
- return save_i387_fxsave( buf );
- } else {
- return save_i387_fsave( buf );
- }
- } else {
- return save_i387_soft( ¤t->thread.i387.soft, buf );
- }
-}
-
-static inline int restore_i387_fsave( struct _fpstate *buf )
-{
- struct task_struct *tsk = current;
- clear_fpu( tsk );
- return __copy_from_user( &tsk->thread.i387.fsave, buf,
- sizeof(struct i387_fsave_struct) );
-}
-
-static inline int restore_i387_fxsave( struct _fpstate *buf )
-{
- struct task_struct *tsk = current;
- clear_fpu( tsk );
- if ( __copy_from_user( &tsk->thread.i387.fxsave, &buf->_fxsr_env[0],
- sizeof(struct i387_fxsave_struct) ) )
- return 1;
- /* mxcsr bit 6 and 31-16 must be zero for security reasons */
- tsk->thread.i387.fxsave.mxcsr &= 0xffbf;
- return convert_fxsr_from_user( &tsk->thread.i387.fxsave, buf );
-}
-
-int restore_i387( struct _fpstate *buf )
-{
- int err;
-
- if ( HAVE_HWFP ) {
- if ( cpu_has_fxsr ) {
- err = restore_i387_fxsave( buf );
- } else {
- err = restore_i387_fsave( buf );
- }
- } else {
- err = restore_i387_soft( ¤t->thread.i387.soft, buf );
- }
- current->used_math = 1;
- return err;
-}
-
-/*
- * ptrace request handlers.
- */
-
-static inline int get_fpregs_fsave( struct user_i387_struct *buf,
- struct task_struct *tsk )
-{
- return __copy_to_user( buf, &tsk->thread.i387.fsave,
- sizeof(struct user_i387_struct) );
-}
-
-static inline int get_fpregs_fxsave( struct user_i387_struct *buf,
- struct task_struct *tsk )
-{
- return convert_fxsr_to_user( (struct _fpstate *)buf,
- &tsk->thread.i387.fxsave );
-}
-
-int get_fpregs( struct user_i387_struct *buf, struct task_struct *tsk )
-{
- if ( HAVE_HWFP ) {
- if ( cpu_has_fxsr ) {
- return get_fpregs_fxsave( buf, tsk );
- } else {
- return get_fpregs_fsave( buf, tsk );
- }
- } else {
- return save_i387_soft( &tsk->thread.i387.soft,
- (struct _fpstate *)buf );
- }
-}
-
-static inline int set_fpregs_fsave( struct task_struct *tsk,
- struct user_i387_struct *buf )
-{
- return __copy_from_user( &tsk->thread.i387.fsave, buf,
- sizeof(struct user_i387_struct) );
-}
-
-static inline int set_fpregs_fxsave( struct task_struct *tsk,
- struct user_i387_struct *buf )
-{
- return convert_fxsr_from_user( &tsk->thread.i387.fxsave,
- (struct _fpstate *)buf );
-}
-
-int set_fpregs( struct task_struct *tsk, struct user_i387_struct *buf )
-{
- if ( HAVE_HWFP ) {
- if ( cpu_has_fxsr ) {
- return set_fpregs_fxsave( tsk, buf );
- } else {
- return set_fpregs_fsave( tsk, buf );
- }
- } else {
- return restore_i387_soft( &tsk->thread.i387.soft,
- (struct _fpstate *)buf );
- }
-}
-
-int get_fpxregs( struct user_fxsr_struct *buf, struct task_struct *tsk )
-{
- if ( cpu_has_fxsr ) {
- if (__copy_to_user( (void *)buf, &tsk->thread.i387.fxsave,
- sizeof(struct user_fxsr_struct) ))
- return -EFAULT;
- return 0;
- } else {
- return -EIO;
- }
-}
-
-int set_fpxregs( struct task_struct *tsk, struct user_fxsr_struct *buf )
-{
- if ( cpu_has_fxsr ) {
- __copy_from_user( &tsk->thread.i387.fxsave, (void *)buf,
- sizeof(struct user_fxsr_struct) );
- /* mxcsr bit 6 and 31-16 must be zero for security reasons */
- tsk->thread.i387.fxsave.mxcsr &= 0xffbf;
- return 0;
- } else {
- return -EIO;
- }
-}
-
-/*
- * FPU state for core dumps.
- */
-
-static inline void copy_fpu_fsave( struct task_struct *tsk,
- struct user_i387_struct *fpu )
-{
- memcpy( fpu, &tsk->thread.i387.fsave,
- sizeof(struct user_i387_struct) );
-}
-
-static inline void copy_fpu_fxsave( struct task_struct *tsk,
- struct user_i387_struct *fpu )
-{
- unsigned short *to;
- unsigned short *from;
- int i;
-
- memcpy( fpu, &tsk->thread.i387.fxsave, 7 * sizeof(long) );
-
- to = (unsigned short *)&fpu->st_space[0];
- from = (unsigned short *)&tsk->thread.i387.fxsave.st_space[0];
- for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
- memcpy( to, from, 5 * sizeof(unsigned short) );
- }
-}
-
-int dump_fpu( struct pt_regs *regs, struct user_i387_struct *fpu )
-{
- int fpvalid;
- struct task_struct *tsk = current;
-
- fpvalid = tsk->used_math;
- if ( fpvalid ) {
- unlazy_fpu( tsk );
- if ( cpu_has_fxsr ) {
- copy_fpu_fxsave( tsk, fpu );
- } else {
- copy_fpu_fsave( tsk, fpu );
- }
- }
-
- return fpvalid;
-}
-
-int dump_extended_fpu( struct pt_regs *regs, struct user_fxsr_struct *fpu )
-{
- int fpvalid;
- struct task_struct *tsk = current;
-
- fpvalid = tsk->used_math && cpu_has_fxsr;
- if ( fpvalid ) {
- unlazy_fpu( tsk );
- memcpy( fpu, &tsk->thread.i387.fxsave,
- sizeof(struct user_fxsr_struct) );
- }
-
- return fpvalid;
-}
+++ /dev/null
-#ifndef _I386_PGTABLE_3LEVEL_H
-#define _I386_PGTABLE_3LEVEL_H
-
-#error "PAE unsupported"
-
-/*
- * Intel Physical Address Extension (PAE) Mode - three-level page
- * tables on PPro+ CPUs.
- *
- * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
- */
-
-/*
- * PGDIR_SHIFT determines what a top-level page table entry can map
- */
-#define PGDIR_SHIFT 30
-#define PTRS_PER_PGD 4
-
-/*
- * PMD_SHIFT determines the size of the area a middle-level
- * page table can map
- */
-#define PMD_SHIFT 21
-#define PTRS_PER_PMD 512
-
-/*
- * entries per page directory level
- */
-#define PTRS_PER_PTE 512
-
-#define pte_ERROR(e) \
- printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low)
-#define pmd_ERROR(e) \
- printk("%s:%d: bad pmd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
-#define pgd_ERROR(e) \
- printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
-
-static inline int pgd_none(pgd_t pgd) { return 0; }
-static inline int pgd_bad(pgd_t pgd) { return 0; }
-static inline int pgd_present(pgd_t pgd) { return 1; }
-
-/* Rules for using set_pte: the pte being assigned *must* be
- * either not present or in a state where the hardware will
- * not attempt to update the pte. In places where this is
- * not possible, use pte_get_and_clear to obtain the old pte
- * value and then use set_pte to update it. -ben
- */
-static inline void set_pte(pte_t *ptep, pte_t pte)
-{
- ptep->pte_high = pte.pte_high;
- smp_wmb();
- ptep->pte_low = pte.pte_low;
-}
-#define set_pmd(pmdptr,pmdval) \
- set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
-#define set_pgd(pgdptr,pgdval) \
- set_64bit((unsigned long long *)(pgdptr),pgd_val(pgdval))
-#define set_pte_atomic(pteptr,pteval) \
- set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
-
-
-/*
- * Pentium-II erratum A13: in PAE mode we explicitly have to flush
- * the TLB via cr3 if the top-level pgd is changed...
- * We do not let the generic code free and clear pgd entries due to
- * this erratum.
- */
-static inline void pgd_clear (pgd_t * pgd) { }
-
-#define pgd_page(pgd) \
-((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
-
-/* Find an entry in the second-level page table.. */
-#define pmd_offset(dir, address) ((pmd_t *) pgd_page(*(dir)) + \
- __pmd_offset(address))
-
-static inline pte_t ptep_get_and_clear(pte_t *ptep)
-{
- pte_t res;
-
- /* xchg acts as a barrier before the setting of the high bits */
- res.pte_low = xchg(&ptep->pte_low, 0);
- res.pte_high = ptep->pte_high;
- ptep->pte_high = 0;
-
- return res;
-}
-
-static inline int pte_same(pte_t a, pte_t b)
-{
- return a.pte_low == b.pte_low && a.pte_high == b.pte_high;
-}
-
-#define pte_page(x) (mem_map+(((x).pte_low >> PAGE_SHIFT) | ((x).pte_high << (32 - PAGE_SHIFT))))
-#define pte_none(x) (!(x).pte_low && !(x).pte_high)
-
-static inline pte_t __mk_pte(unsigned long page_nr, pgprot_t pgprot)
-{
- pte_t pte;
-
- pte.pte_high = page_nr >> (32 - PAGE_SHIFT);
- pte.pte_low = (page_nr << PAGE_SHIFT) | pgprot_val(pgprot);
- return pte;
-}
-
-#endif /* _I386_PGTABLE_3LEVEL_H */
projects / xen.git / commitdiff