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experimental code copy support - fixed A20 emulation 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@621 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-02-16 22:08:32 +00:00
parent 77fef8c148
commit 0e4b179d33
1 changed files with 28 additions and 1 deletions
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29
target-i386/helper2.c
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@ -31,6 +31,13 @@
//#define DEBUG_MMU //#define DEBUG_MMU
#ifdef USE_CODE_COPY
#include <asm/ldt.h>
#include <linux/unistd.h>
_syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount)
#endif
CPUX86State *cpu_x86_init(void) CPUX86State *cpu_x86_init(void)
{ {
CPUX86State *env; CPUX86State *env;
@ -84,6 +91,26 @@ CPUX86State *cpu_x86_init(void)
inited = 1; inited = 1;
optimize_flags_init(); optimize_flags_init();
} }
#ifdef USE_CODE_COPY
/* testing code for code copy case */
{
struct modify_ldt_ldt_s ldt;
ldt.entry_number = 1;
ldt.base_addr = (unsigned long)env;
ldt.limit = (sizeof(CPUState) + 0xfff) >> 12;
ldt.seg_32bit = 1;
ldt.contents = MODIFY_LDT_CONTENTS_DATA;
ldt.read_exec_only = 0;
ldt.limit_in_pages = 1;
ldt.seg_not_present = 0;
ldt.useable = 1;
modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */
asm volatile ("movl %0, %%fs" : : "r" ((1 << 3) | 7));
cpu_single_env = env;
}
#endif
return env; return env;
} }
@ -213,7 +240,7 @@ void cpu_x86_set_a20(CPUX86State *env, int a20_state)
#endif #endif
/* if the cpu is currently executing code, we must unlink it and /* if the cpu is currently executing code, we must unlink it and
all the potentially executing TB */ all the potentially executing TB */
cpu_interrupt(env, 0); cpu_interrupt(env, CPU_INTERRUPT_EXITTB);
/* when a20 is changed, all the MMU mappings are invalid, so /* when a20 is changed, all the MMU mappings are invalid, so
we must flush everything */ we must flush everything */