1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/segm-asm.S	Wed Feb 16 07:26:03 2011 +0200
     1.3 @@ -0,0 +1,41 @@
     1.4 +	.data
     1.5 +off:.long 0
     1.6 +seg:.short 0
     1.7 +
     1.8 +	.align
     1.9 +	.short 0
    1.10 +gdt_lim:
    1.11 +	.short 0
    1.12 +gdt_addr:
    1.13 +	.long 0
    1.14 +
    1.15 +	.text
    1.16 +/* setup_selectors(uint16_t code, uint16_t data)
    1.17 + * loads the requested selectors to all the selector registers */
    1.18 +	.globl setup_selectors
    1.19 +setup_selectors:
    1.20 +	/* setup data selectors */
    1.21 +	movl 8(%esp), %eax
    1.22 +	movw %ax, %ss
    1.23 +	movw %ax, %es
    1.24 +	movw %ax, %ds
    1.25 +	movw %ax, %gs
    1.26 +	movw %ax, %fs
    1.27 +	/* setup code selector */
    1.28 +	movl 4(%esp), %eax
    1.29 +	movw %ax, (seg)
    1.30 +	movl $ldcs, (off)
    1.31 +	ljmp *off
    1.32 +ldcs:
    1.33 +	ret
    1.34 +
    1.35 +/* set_gdt(uint32_t addr, uint16_t limit)
    1.36 + * loads the GDTR with the new address and limit for the GDT */
    1.37 +	.globl set_gdt
    1.38 +set_gdt:
    1.39 +	movl 4(%esp), %eax
    1.40 +	movl %eax, (gdt_addr)
    1.41 +	movw 8(%esp), %ax
    1.42 +	movw %ax, (gdt_lim)
    1.43 +	lgdt (gdt_lim)	
    1.44 +	ret