diff options
Diffstat (limited to 'sys/amd64/amd64/bios.c')
| -rw-r--r-- | sys/amd64/amd64/bios.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/sys/amd64/amd64/bios.c b/sys/amd64/amd64/bios.c index 69f6ded..da862ba 100644 --- a/sys/amd64/amd64/bios.c +++ b/sys/amd64/amd64/bios.c @@ -396,18 +396,16 @@ bios16(struct bios_args *args, char *fmt, ...) */ pte = (pt_entry_t *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); ptd = (pd_entry_t *)((u_int)IdlePTD + KERNBASE); + *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; *ptd = vtophys(pte) | PG_RW | PG_V; } else { /* * this is a user-level page table */ pte = PTmap; + *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; } - /* - * install pointer to page 0. we don't need to flush the tlb, - * since there should not be a previous mapping for page 0. - */ - *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; + pmap_invalidate_all(kernel_pmap); /* XXX insurance for now */ stack_top = stack; va_start(ap, fmt); @@ -457,19 +455,21 @@ bios16(struct bios_args *args, char *fmt, ...) bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); i = bios16_call(&args->r, stack_top); - + if (pte == PTmap) { *pte = 0; /* remove entry */ + /* + * XXX only needs to be invlpg(0) but that doesn't work on the 386 + */ + pmap_invalidate_all(kernel_pmap); } else { *ptd = 0; /* remove page table */ + /* + * XXX only needs to be invlpg(0) but that doesn't work on the 386 + */ + pmap_invalidate_all(kernel_pmap); free(pte, M_TEMP); /* ... and free it */ } - - /* - * XXX only needs to be invlpg(0) but that doesn't work on the 386 - */ - pmap_invalidate_all(kernel_pmap); - return (i); } |
