diff options
| author | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2004-02-16 22:08:32 +0000 |
|---|---|---|
| committer | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2004-02-16 22:08:32 +0000 |
| commit | 0e4b179d3308382e9da91a3b8f443d0b72eb0db4 (patch) | |
| tree | 495cde0564d395b6b7110866ff64a6c8d954194d /target-i386 | |
| parent | 77fef8c148e4bec1d1089b3729bd32efdbd3a6c0 (diff) | |
experimental code copy support - fixed A20 emulation
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@621 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/helper2.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/target-i386/helper2.c b/target-i386/helper2.c index f5c31d0df0..e1dc4741d7 100644 --- a/target-i386/helper2.c +++ b/target-i386/helper2.c @@ -31,6 +31,13 @@ //#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 *env; @@ -84,6 +91,26 @@ CPUX86State *cpu_x86_init(void) inited = 1; 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; } @@ -213,7 +240,7 @@ void cpu_x86_set_a20(CPUX86State *env, int a20_state) #endif /* if the cpu is currently executing code, we must unlink it and 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 we must flush everything */ |