diff options
Diffstat (limited to 'i386/i386/ktss.c')
| -rw-r--r-- | i386/i386/ktss.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/i386/i386/ktss.c b/i386/i386/ktss.c index 53c8be9..03d9a04 100644 --- a/i386/i386/ktss.c +++ b/i386/i386/ktss.c @@ -36,6 +36,9 @@ #include "gdt.h" #include "ktss.h" +/* A kernel TSS with a complete I/O bitmap. */ +struct task_tss ktss; + void ktss_init() { @@ -44,16 +47,15 @@ ktss_init() /* Initialize the master TSS descriptor. */ fill_gdt_descriptor(KERNEL_TSS, - kvtolin(&ktss), sizeof(ktss)+65536/8+1-1, + kvtolin(&ktss), sizeof(struct task_tss) - 1, ACC_PL_K|ACC_TSS, 0); /* Initialize the master TSS. */ - ktss.ss0 = KERNEL_DS; - ktss.esp0 = (unsigned)(exception_stack+1024); - ktss.io_bit_map_offset = sizeof(ktss); - + ktss.tss.ss0 = KERNEL_DS; + ktss.tss.esp0 = (unsigned)(exception_stack+1024); + ktss.tss.io_bit_map_offset = IOPB_INVAL; /* Set the last byte in the I/O bitmap to all 1's. */ - ((unsigned char*)&ktss)[sizeof(ktss)+65536/8] = 0xff; + ktss.barrier = 0xff; /* Load the TSS. */ ltr(KERNEL_TSS); |