5593eaa854
Fix incorrect assembly constraints. In particular, fix memory constraints used inside push..pop, which can cause invalid operation since gcc may generate %esp-relative references. Additionally: outl() should have "dN" not "dn". query_mca() shouldn't listen 16/32-bit registers in an 8-bit only context. has_eflag(): the "mask" is only used well after both the stack pointer and the output registers have been touched; this requires the output registers to be earlyclobbers (=&) and the input to exclude memory (so "ri", not "g"). Thanks to Etienne Lorrain and Chuck Ebbert for prompting this review. Cc: Etienne Lorrain <etienne_lorrain@yahoo.fr> Cc: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
297 lines
6.2 KiB
C
297 lines
6.2 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright 2007 rPath, Inc. - All Rights Reserved
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*
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* This file is part of the Linux kernel, and is made available under
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* the terms of the GNU General Public License version 2.
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*
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* ----------------------------------------------------------------------- */
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/*
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* arch/i386/boot/boot.h
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*
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* Header file for the real-mode kernel code
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*/
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#ifndef BOOT_BOOT_H
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#define BOOT_BOOT_H
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#ifndef __ASSEMBLY__
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#include <stdarg.h>
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#include <linux/types.h>
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#include <linux/edd.h>
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#include <asm/boot.h>
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#include <asm/bootparam.h>
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/* Useful macros */
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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extern struct setup_header hdr;
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extern struct boot_params boot_params;
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/* Basic port I/O */
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static inline void outb(u8 v, u16 port)
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{
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asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
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}
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static inline u8 inb(u16 port)
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{
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u8 v;
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asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
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return v;
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}
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static inline void outw(u16 v, u16 port)
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{
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asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
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}
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static inline u16 inw(u16 port)
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{
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u16 v;
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asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
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return v;
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}
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static inline void outl(u32 v, u16 port)
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{
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asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
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}
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static inline u32 inl(u32 port)
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{
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u32 v;
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asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
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return v;
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}
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static inline void io_delay(void)
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{
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const u16 DELAY_PORT = 0x80;
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asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
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}
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/* These functions are used to reference data in other segments. */
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static inline u16 ds(void)
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{
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u16 seg;
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asm("movw %%ds,%0" : "=rm" (seg));
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return seg;
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}
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static inline void set_fs(u16 seg)
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{
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asm volatile("movw %0,%%fs" : : "rm" (seg));
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}
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static inline u16 fs(void)
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{
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u16 seg;
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asm("movw %%fs,%0" : "=rm" (seg));
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return seg;
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}
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static inline void set_gs(u16 seg)
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{
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asm volatile("movw %0,%%gs" : : "rm" (seg));
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}
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static inline u16 gs(void)
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{
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u16 seg;
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asm("movw %%gs,%0" : "=rm" (seg));
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return seg;
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}
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typedef unsigned int addr_t;
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static inline u8 rdfs8(addr_t addr)
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{
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u8 v;
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asm("movb %%fs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
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return v;
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}
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static inline u16 rdfs16(addr_t addr)
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{
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u16 v;
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asm("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
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return v;
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}
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static inline u32 rdfs32(addr_t addr)
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{
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u32 v;
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asm("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
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return v;
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}
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static inline void wrfs8(u8 v, addr_t addr)
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{
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asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "r" (v));
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}
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static inline void wrfs16(u16 v, addr_t addr)
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{
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asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "r" (v));
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}
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static inline void wrfs32(u32 v, addr_t addr)
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{
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asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "r" (v));
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}
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static inline u8 rdgs8(addr_t addr)
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{
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u8 v;
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asm("movb %%gs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
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return v;
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}
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static inline u16 rdgs16(addr_t addr)
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{
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u16 v;
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asm("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
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return v;
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}
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static inline u32 rdgs32(addr_t addr)
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{
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u32 v;
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asm("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
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return v;
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}
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static inline void wrgs8(u8 v, addr_t addr)
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{
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asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "r" (v));
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}
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static inline void wrgs16(u16 v, addr_t addr)
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{
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asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "r" (v));
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}
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static inline void wrgs32(u32 v, addr_t addr)
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{
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asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "r" (v));
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}
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/* Note: these only return true/false, not a signed return value! */
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static inline int memcmp(const void *s1, const void *s2, size_t len)
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{
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u8 diff;
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asm("repe; cmpsb; setnz %0"
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: "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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return diff;
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}
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static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
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{
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u8 diff;
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asm("fs; repe; cmpsb; setnz %0"
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: "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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return diff;
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}
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static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
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{
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u8 diff;
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asm("gs; repe; cmpsb; setnz %0"
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: "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
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return diff;
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}
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static inline int isdigit(int ch)
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{
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return (ch >= '0') && (ch <= '9');
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}
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/* Heap -- available for dynamic lists. */
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#define STACK_SIZE 512 /* Minimum number of bytes for stack */
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extern char _end[];
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extern char *HEAP;
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extern char *heap_end;
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#define RESET_HEAP() ((void *)( HEAP = _end ))
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static inline char *__get_heap(size_t s, size_t a, size_t n)
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{
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char *tmp;
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HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
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tmp = HEAP;
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HEAP += s*n;
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return tmp;
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}
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#define GET_HEAP(type, n) \
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((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
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static inline int heap_free(void)
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{
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return heap_end-HEAP;
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}
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/* copy.S */
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void copy_to_fs(addr_t dst, void *src, size_t len);
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void *copy_from_fs(void *dst, addr_t src, size_t len);
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void copy_to_gs(addr_t dst, void *src, size_t len);
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void *copy_from_gs(void *dst, addr_t src, size_t len);
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void *memcpy(void *dst, void *src, size_t len);
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void *memset(void *dst, int c, size_t len);
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#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
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#define memset(d,c,l) __builtin_memset(d,c,l)
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/* a20.c */
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int enable_a20(void);
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/* apm.c */
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int query_apm_bios(void);
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/* cmdline.c */
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int cmdline_find_option(const char *option, char *buffer, int bufsize);
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/* cpu.c, cpucheck.c */
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int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
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int validate_cpu(void);
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/* edd.c */
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void query_edd(void);
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/* header.S */
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void __attribute__((noreturn)) die(void);
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/* mca.c */
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int query_mca(void);
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/* memory.c */
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int detect_memory(void);
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/* pm.c */
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void __attribute__((noreturn)) go_to_protected_mode(void);
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/* pmjump.S */
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void __attribute__((noreturn))
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protected_mode_jump(u32 entrypoint, u32 bootparams);
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/* printf.c */
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int sprintf(char *buf, const char *fmt, ...);
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int vsprintf(char *buf, const char *fmt, va_list args);
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int printf(const char *fmt, ...);
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/* string.c */
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int strcmp(const char *str1, const char *str2);
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size_t strnlen(const char *s, size_t maxlen);
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unsigned int atou(const char *s);
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/* tty.c */
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void puts(const char *);
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void putchar(int);
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int getchar(void);
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void kbd_flush(void);
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int getchar_timeout(void);
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/* video.c */
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void set_video(void);
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/* video-vesa.c */
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void vesa_store_edid(void);
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/* voyager.c */
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int query_voyager(void);
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#endif /* __ASSEMBLY__ */
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#endif /* BOOT_BOOT_H */
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