diff options
Diffstat (limited to 'arch/x86/lib/realmode.c')
| -rw-r--r-- | arch/x86/lib/realmode.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/arch/x86/lib/realmode.c b/arch/x86/lib/realmode.c index 6aa0f23..75511b2 100644 --- a/arch/x86/lib/realmode.c +++ b/arch/x86/lib/realmode.c @@ -26,15 +26,12 @@ #include <asm/ptrace.h> #include <asm/realmode.h> -#define REALMODE_MAILBOX ((char*)0xe00) - -extern ulong __realmode_start; -extern ulong __realmode_size; -extern char realmode_enter; +#define REALMODE_MAILBOX ((char *)0xe00) int realmode_setup(void) { - ulong realmode_start = (ulong)&__realmode_start + gd->reloc_off; + /* The realmode section is not relocated and still in the ROM. */ + ulong realmode_start = (ulong)&__realmode_start; ulong realmode_size = (ulong)&__realmode_size; /* copy the realmode switch code */ @@ -63,15 +60,14 @@ int enter_realmode(u16 seg, u16 off, struct pt_regs *in, struct pt_regs *out) in->eip = off; in->xcs = seg; - if (3>(in->esp & 0xffff)) { + if ((in->esp & 0xffff) < 4) printf("Warning: entering realmode with sp < 4 will fail\n"); - } memcpy(REALMODE_MAILBOX, in, sizeof(struct pt_regs)); asm("wbinvd\n"); __asm__ volatile ( - "lcall $0x20,%0\n" : : "i" (&realmode_enter) ); + "lcall $0x20,%0\n" : : "i" (&realmode_enter)); asm("wbinvd\n"); memcpy(out, REALMODE_MAILBOX, sizeof(struct pt_regs)); @@ -79,9 +75,10 @@ int enter_realmode(u16 seg, u16 off, struct pt_regs *in, struct pt_regs *out) return out->eax; } - -/* This code is supposed to access a realmode interrupt - * it does currently not work for me */ +/* + * This code is supposed to access a realmode interrupt + * it does currently not work for me + */ int enter_realmode_int(u8 lvl, struct pt_regs *in, struct pt_regs *out) { /* place two instructions at 0x700 */ @@ -92,5 +89,5 @@ int enter_realmode_int(u8 lvl, struct pt_regs *in, struct pt_regs *out) enter_realmode(0x00, 0x700, in, out); - return out->eflags&1; + return out->eflags & 0x00000001; } |