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Diffstat (limited to 'memtestEDK/Memtest/SingleComponents/setup.S')
| -rw-r--r-- | memtestEDK/Memtest/SingleComponents/setup.S | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/memtestEDK/Memtest/SingleComponents/setup.S b/memtestEDK/Memtest/SingleComponents/setup.S deleted file mode 100644 index f80875b..0000000 --- a/memtestEDK/Memtest/SingleComponents/setup.S +++ /dev/null @@ -1,154 +0,0 @@ -/* - * setup.s is responsible for getting the system data from the BIOS, - * and putting them into the appropriate places in system memory. - * both setup.s and system has been loaded by the bootblock. - * - * 1-Jan-96 Modified by Chris Brady for use as a boot/loader for memtest-86. - */ - -#define __ASSEMBLY__ -#include "defs.h" - -.code16 -.section ".setup", "ax", @progbits -.globl start -start: -# ok, the read went well -# now we want to move to protected mode ... - - - cli # no interrupts allowed # - movb $0x80, %al # disable NMI for the bootup sequence - outb %al, $0x70 - -# The system will move itself to its rightful place. -# reload the segment registers and the stack since the -# APs also execute this code -#ljmp $INITSEG, $(reload - start + 0x200) -reload: - movw $INITSEG, %ax - movw %ax, %ds - movw %ax, %es - movw %ax, %fs - movw %ax, %ss # reset the stack to INITSEG:0x4000-12. - movw %dx, %sp - push %cs - pop %ds - lidt idt_48 - start # load idt with 0,0 - lgdt gdt_48 - start # load gdt with whatever appropriate - -# that was painless, now we enable A20 -# start from grub-a20.patch - /* - * try to switch gateA20 using PORT92, the "Fast A20 and Init" - * register - */ - mov $0x92, %dx - inb %dx, %al - /* skip the port92 code if it's unimplemented (read returns 0xff) */ - cmpb $0xff, %al - jz alt_a20_done - - /* set or clear bit1, the ALT_A20_GATE bit */ - movb 4(%esp), %ah - testb %ah, %ah - jz alt_a20_cont1 - orb $2, %al - jmp alt_a20_cont2 -alt_a20_cont1: - and $0xfd, %al - - /* clear the INIT_NOW bit; don't accidently reset the machine */ -alt_a20_cont2: - and $0xfe, %al - outb %al, %dx - -alt_a20_done: -# end from grub-a20.patch - - call empty_8042 - - movb $0xD1, %al # command write - outb %al, $0x64 - call empty_8042 - - movb $0xDF, %al # A20 on - outb %al, $0x60 - call empty_8042 - -/* - * Note that the short jump isn't strictly needed, althought there are - * reasons why it might be a good idea. It won't hurt in any case. - */ - movw $0x0001, %ax # protected mode (PE) bit - lmsw %ax # This is it# - jmp flush_instr -flush_instr: - movw $KERNEL_DS, %ax - movw %ax, %ds - movw %ax, %es - movw %ax, %ss - movw %ax, %fs - movw %ax, %gs - -data32 ljmp $KERNEL_CS, $(TSTLOAD <<4) # jmp offset 2000 of segment 0x10 (cs) - -/* - * This routine checks that the keyboard command queue is empty - * (after emptying the output buffers) - * - * No timeout is used - if this hangs there is something wrong with - * the machine, and we probably couldn't proceed anyway. - */ -empty_8042: - call delay - inb $0x64, %al # 8042 status port - cmpb $0xff, %al # from grub-a20-patch, skip if not impl - jz empty_8042_ret - testb $1, %al # output buffer? - jz no_output - call delay - inb $0x60, %al # read it - jmp empty_8042 - -no_output: - testb $2, %al # is input buffer full? - jnz empty_8042 # yes - loop -empty_8042_ret: - ret -# -# Delay is needed after doing i/o -# -delay: - .word 0x00eb # jmp $+2 - ret - -gdt: - .word 0,0,0,0 # dummy - - .word 0,0,0,0 # unused - - .word 0x7FFF # limit 128mb - .word 0x0000 # base address=0 - .word 0x9A00 # code read/exec - .word 0x00C0 # granularity=4096, 386 - - .word 0x7FFF # limit 128mb - .word 0x0000 # base address=0 - .word 0x9200 # data read/write - .word 0x00C0 # granularity=4096, 386 - -idt_48: - .word 0 # idt limit=0 - .long 0 # idt base=0L - -gdt_48: - .word 0x800 # gdt limit=2048, 256 GDT entries - .word 512+gdt - start,0x9 # gdt base = 0X9xxxx - -msg1: - .asciz "Setup.S\r\n" - - /* Pad setup to the proper size */ - .org (SETUPSECS*512) - |