diff options
| author | Miguel <m.i@gmx.at> | 2018-09-02 00:08:42 +0200 |
|---|---|---|
| committer | Miguel <m.i@gmx.at> | 2018-09-02 00:08:42 +0200 |
| commit | 8e3411139b27a3421e9ac75c13f14f99f6dd3137 (patch) | |
| tree | cf8b53ab02863117c310bde11ee4683e134cf1b2 /asm/helpers.s | |
| parent | 0fff2e6dc6fae82da1c7978918a490c25cc36f04 (diff) | |
syscalls
Diffstat (limited to 'asm/helpers.s')
| -rw-r--r-- | asm/helpers.s | 44 |
1 files changed, 0 insertions, 44 deletions
diff --git a/asm/helpers.s b/asm/helpers.s deleted file mode 100644 index 135443d..0000000 --- a/asm/helpers.s +++ /dev/null @@ -1,44 +0,0 @@ -//http://wiki.osdev.org/GDT_Tutorial -.global setup_gdt -.global tss_flush - -// call as setup_gdt(GDT,sizeof(GDT)) -setup_gdt: - - // re-fill gdt_descriptor with new GDT location and size - movl 4(%esp),%eax - movl %eax, gdt_descriptor+2 - - movw 8(%esp),%ax - movw %ax, gdt_descriptor - // - - lgdt gdt_descriptor #load new descriptor table! - - // reload to take effect - reloadSegments: - - #Reload CS register containing code selector: - jmp $0x08,$reload_CS # 0x08 points at the new code selector - - reload_CS: - mov $0x10, %ax #0x10 points at the new data selector - mov %ax, %ds - mov %ax, %es - mov %ax, %fs - mov %ax, %gs - mov %ax, %ss - - tss_flush: - - movw $0x2B,%ax # Load the index of our TSS structure - The index is - # 0x28, as it is the 5th selector and each is 8 bytes - # long, but we set the bottom two bits (making 0x2B) - # so that it has an RPL of 3, not zero. - ltr %ax # Load 0x2B into the task state register. - - ret - - - -ret |