diff options
Diffstat (limited to 'purgatory/arch/i386/linux-entry16.S')
| -rw-r--r-- | purgatory/arch/i386/linux-entry16.S | 623 |
1 files changed, 0 insertions, 623 deletions
diff --git a/purgatory/arch/i386/linux-entry16.S b/purgatory/arch/i386/linux-entry16.S deleted file mode 100644 index 7ab0b2a..0000000 --- a/purgatory/arch/i386/linux-entry16.S +++ /dev/null @@ -1,623 +0,0 @@ -/* - * kexec: Linux boots Linux - * - * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation (version 2 of the License). - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#if 1 -#define TTYS0_BASE 0x3f8 -#define TTYS0_RBR (TTYS0_BASE+0x00) -#define TTYS0_TBR TTYS0_RBR -#define TTYS0_LSR (TTYS0_BASE+0x05) - - - /* uses: ax, dx */ -#define TTYS0_TX_AL \ - mov %al, %ah ; \ -9: mov $TTYS0_LSR, %dx ; \ - inb %dx, %al ; \ - test $0x20, %al ; \ - je 9b ; \ - mov $TTYS0_TBR, %dx ; \ - mov %ah, %al ; \ - outb %al, %dx ; \ -9: mov $TTYS0_LSR, %dx ; \ - inb %dx, %al ; \ - test $0x40, %al ; \ - jz 9b - - - - /* uses: ax, dx */ -#define TTYS0_TX_CHAR(byte) \ - mov byte, %al ; \ - TTYS0_TX_AL - - /* uses: ax, dx */ -#define TTYS0_TX_HEX32(lword) \ - mov lword, %eax ; \ - shr $28, %eax ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $24, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $20, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $16, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $12, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $8, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $4, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL - - -#define DEBUG_CHAR(x) TTYS0_TX_CHAR($x) ; TTYS0_TX_CHAR($'\r') ; TTYS0_TX_CHAR($'\n') -#define DEBUG_TX_HEX32(x) TTYS0_TX_HEX32(x) ; TTYS0_TX_CHAR($'\r') ; TTYS0_TX_CHAR($'\n') -#else -#define DEBUG_CHAR(x) -#define DEBUG_TX_HEX32(x) -#endif - -#undef i386 - .text - .globl entry16, entry16_regs - .arch i386 - .balign 16 -entry16: - .code32 - -DEBUG_CHAR('a') - /* Setup the classic BIOS interrupt table at 0x0 */ - lidt idtptr - -DEBUG_CHAR('b') - /* Provide us with 16bit segments that we can use */ - lgdt gdt - -DEBUG_CHAR('c') - /* Note we don't disable the a20 line, (this shouldn't be required) - * The code to do it is in kexec_test and it is a real pain. - * I will worry about that when I need it. - */ - - /* Load 16bit data segments, to ensure the segment limits are set */ - movl $0x10, %eax - movl %eax, %ds - movl %eax, %es - movl %eax, %ss - movl %eax, %fs - movl %eax, %gs - -DEBUG_CHAR('d') - - /* switch to 16bit mode */ - ljmp $0x08, $1f - entry16 -1: - .code16 -DEBUG_CHAR('e') - /* Disable Paging and protected mode */ - /* clear the PG & PE bits of CR0 */ - movl %cr0,%eax - andl $~((1 << 31)|(1<<0)),%eax - movl %eax,%cr0 - -DEBUG_CHAR('f') - /* make intersegment jmp to flush the processor pipeline - * and reload %cs:%eip (to clear upper 16 bits of %eip). - */ - ljmp *(realptr - entry16) -3: -DEBUG_CHAR('g') - /* we are in real mode now - * set up the real mode segment registers : %ds, $ss, %es - */ - /* Setup the data segment */ - movw %cs, %ax - movw %ax, %ds - -DEBUG_CHAR('h') - /* Load the registers */ - movl eax - entry16, %eax - movl ebx - entry16, %ebx - movl ecx - entry16, %ecx - movl edx - entry16, %edx - movl esi - entry16, %esi - movl edi - entry16, %esi - movl esp - entry16, %esp - movl ebp - entry16, %ebp - movw es - entry16, %es - movw ss - entry16, %ss - movw fs - entry16, %fs - movw gs - entry16, %gs - movw ds - entry16, %ds - - /* Jump to the kernel entrypoint */ - ljmp %cs:*(realdest - entry16) - - .balign 4 -entry16_regs: -eax: .long 0x00000000 -ebx: .long 0x00000000 -ecx: .long 0x00000000 -edx: .long 0x00000000 -esi: .long 0x00000000 -edi: .long 0x00000000 -esp: .long 0x00000000 -ebp: .long 0x00000000 -ds: .word 0x0000 -es: .word 0x0000 -ss: .word 0x0000 -fs: .word 0x0000 -gs: .word 0x0000 -realdest: -ip: .word 0x0000 -cs: .word 0x0000 - .size entry16_regs, . - entry16_regs - - .balign 16 -realptr: - .word 3b - entry16 - .word 0x0000 - - .data - .balign 4 - -idtptr: - /* 256 entry idt at 0 */ - .word 0x400 - 1 - .word 0, 0 - -gdt: - /* 0x00 unusable segment so used as the gdt ptr */ - .word gdt_end - gdt - 1 - .long gdt - .word 0 - - /* 0x08 16 bit real mode code segment */ - .word 0xffff, 0x0000 - .byte 0x00, 0x9b, 0x00, 0x00 - - /* 0x10 16 bit real mode data segment */ - .word 0xffff, 0x0000 - .byte 0x00, 0x93, 0x00, 0x00 -gdt_end: -/* - * kexec: Linux boots Linux - * - * Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation (version 2 of the License). - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#if 1 -#define TTYS0_BASE 0x3f8 -#define TTYS0_RBR (TTYS0_BASE+0x00) -#define TTYS0_TBR TTYS0_RBR -#define TTYS0_LSR (TTYS0_BASE+0x05) - - - /* uses: ax, dx */ -#define TTYS0_TX_AL \ - mov %al, %ah ; \ -9: mov $TTYS0_LSR, %dx ; \ - inb %dx, %al ; \ - test $0x20, %al ; \ - je 9b ; \ - mov $TTYS0_TBR, %dx ; \ - mov %ah, %al ; \ - outb %al, %dx ; \ -9: mov $TTYS0_LSR, %dx ; \ - inb %dx, %al ; \ - test $0x40, %al ; \ - jz 9b - - - - /* uses: ax, dx */ -#define TTYS0_TX_CHAR(byte) \ - mov byte, %al ; \ - TTYS0_TX_AL - - /* uses: ax, dx */ -#define TTYS0_TX_HEX32(lword) \ - mov lword, %eax ; \ - shr $28, %eax ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $24, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $20, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $16, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $12, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $8, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - shr $4, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL ; \ - ; \ - mov lword, %eax ; \ - and $0x0f, %al ; \ - add $'0', %al ; \ - cmp $'9', %al ; \ - jle 9f ; \ - add $39, %al ; \ -9: ; \ - TTYS0_TX_AL - - -#define DEBUG_CHAR(x) TTYS0_TX_CHAR($x) ; TTYS0_TX_CHAR($'\r') ; TTYS0_TX_CHAR($'\n') -#define DEBUG_TX_HEX32(x) TTYS0_TX_HEX32(x) ; TTYS0_TX_CHAR($'\r') ; TTYS0_TX_CHAR($'\n') -#else -#define DEBUG_CHAR(x) -#define DEBUG_TX_HEX32(x) -#endif - -.data - .globl setup16_debug_start, setup16_debug_end, setup16_debug_size, setup16_debug_align - .globl setup16_debug_regs - .globl setup16_debug_kernel_pre_protected - .globl setup16_debug_first_code32 - .globl setup16_debug_old_code32 -setup16_debug_start: -_reloc = . - .balign 16 - .code32 -DEBUG_CHAR('a') - /* Compute where I am running at */ - call 1f -1: popl %ebx - subl $(1b - _reloc), %ebx - - /* Remember where I am running at */ - movl %ebx, location - _reloc(%ebx) - -DEBUG_CHAR('b') - /* Fixup my real mode segment */ - movl %ebx, %eax - shrl $4, %eax - movw %ax, 2 + realptr - _reloc(%ebx) - -DEBUG_CHAR('c') - /* Fixup the gdt */ - movl %ebx, %eax - shll $16, %eax - - movl %ebx, %ecx - shrl $16, %ecx - andl $0xff, %ecx - - movl %ebx, %edx - andl $0xff000000, %edx - orl %edx, %ecx - - addl %ebx, gdtaddr - _reloc(%ebx) - addl %ebx, debug_gdtaddr - _reloc(%ebx) - orl %eax, 0x08 + gdt - _reloc(%ebx) - orl %ecx, 0x0c + gdt - _reloc(%ebx) - orl %eax, 0x10 + gdt - _reloc(%ebx) - orl %ecx, 0x14 + gdt - _reloc(%ebx) - - - -DEBUG_CHAR('d') - /* Setup the classic BIOS interrupt table at 0x0 */ - lidt idtptr - _reloc(%ebx) - - /* Provide us with 16bit segments that we can use */ - lgdt gdtptr - _reloc(%ebx) - - /* Note we don't disable the a20 line, (this shouldn't be required) - * The code to do it is in kexec_test and it is a real pain. - * I will worry about that when I need it. - */ - - /* Load 16bit data segments, to ensure the segment limits are set */ - movl $0x10, %eax - movl %eax, %ds - movl %eax, %es - movl %eax, %ss - movl %eax, %fs - movl %eax, %gs - - /* switch to 16bit mode */ - - ljmp $0x08, $2f - _reloc -2: - .code16 -DEBUG_CHAR('e') - /* Disable Paging and protected mode */ - /* clear the PG & PE bits of CR0 */ - movl %cr0,%eax - andl $~((1 << 31)|(1<<0)),%eax - movl %eax,%cr0 - -DEBUG_CHAR('f') - /* make intersegment jmp to flush the processor pipeline - * and reload %cs:%eip (to clear upper 16 bits of %eip). - */ - ljmp *(realptr - _reloc) -3: -DEBUG_CHAR('g') - /* we are in real mode now - * set up the real mode segment registers : %ds, $ss, %es - */ - /* Setup the data segment */ - movw %cs, %ax - movw %ax, %ds - -DEBUG_CHAR('h') - /* Load the registers */ - movl eax - _reloc, %eax - movl ebx - _reloc, %ebx - movl ecx - _reloc, %ecx - movl edx - _reloc, %edx - movl esi - _reloc, %esi - movl edi - _reloc, %esi - movl esp - _reloc, %esp - movl ebp - _reloc, %ebp - movw es - _reloc, %es - movw ss - _reloc, %ss - movw fs - _reloc, %fs - movw gs - _reloc, %gs - movw ds - _reloc, %ds - - /* Jump to the kernel entrypoint */ - ljmp %cs:*(realdest - _reloc) - -setup16_debug_regs: -eax: .long 0x00000000 -ebx: .long 0x00000000 -ecx: .long 0x00000000 -edx: .long 0x00000000 -esi: .long 0x00000000 -edi: .long 0x00000000 -esp: .long 0x00000000 -ebp: .long 0x00000000 -ds: .word 0x0000 -es: .word 0x0000 -ss: .word 0x0000 -fs: .word 0x0000 -gs: .word 0x0000 -realdest: -ip: .word 0x0000 -cs: .word 0x0000 - - .balign 16 -realptr: - .word 3b - _reloc - .word 0x0000 - -idtptr: - /* 256 entry idt at 0 */ - .word 0x400 - 1 - .word 0, 0 - -gdtptr: - .word gdt_end - gdt - 1 -gdtaddr: - .long gdt - _reloc - -gdt: - /* dummy */ - .word 0, 0, 0, 0 - - /* 16 bit real mode code segment */ - .word 0xffff, 0x0000 - .byte 0x00, 0x9b, 0x00, 0x00 - - /* 16 bit real mode data segment */ - .word 0xffff, 0x0000 - .byte 0x00, 0x93, 0x00, 0x00 -gdt_end: - -debug_gdt: - /* 0x00 */ - .word debug_gdt_end - debug_gdt - 1 -debug_gdtaddr: - .long debug_gdt - _reloc - .word 0 - - /* 0x08 */ - .word 0, 0, 0, 0 /* Nothing in the first gdt entry */ - - /* 0x10 4Gb - (0x100000*0x1000 = 4Gb), base address = 0, code read/exec, granularity = 4096, 386 */ - .word 0xFFFF, 0x00, 0x9A00, 0x00CF - /* 0x18 4Gb - (0x100000*0x1000 = 4Gb*), base address = 0, data read/write, granularity = 4096, 386 */ - .word 0xFFFF, 0x0000, 0x9200, 0x00CF - - - /* 0x20 4Gb - (0x100000*0x1000 = 4Gb), base address = 0, code read/exec, granularity = 4096, 386 */ - .word 0xFFFF, 0x00, 0x9A00, 0x00CF - /* 0x28 4Gb - (0x100000*0x1000 = 4Gb*), base address = 0, data read/write, granularity = 4096, 386 */ - .word 0xFFFF, 0x0000, 0x9200, 0x00CF - - - /* 0x30 4Gb - (0x100000*0x1000 = 4Gb), base address = 0, code read/exec, granularity = 4096, 386 */ - .word 0xFFFF, 0x00, 0x9A00, 0x00CF - /* 0x38 4Gb - (0x100000*0x1000 = 4Gb*), base address = 0, data read/write, granularity = 4096, 386 */ - .word 0xFFFF, 0x0000, 0x9200, 0x00CF - - - /* 0x40 4Gb - (0x100000*0x1000 = 4Gb), base address = 0, code read/exec, granularity = 4096, 386 */ - .word 0xFFFF, 0x00, 0x9A00, 0x00CF - /* 0x48 4Gb - (0x100000*0x1000 = 4Gb*), base address = 0, data read/write, granularity = 4096, 386 */ - .word 0xFFFF, 0x0000, 0x9200, 0x00CF - - - /* 0x50 4Gb - (0x100000*0x1000 = 4Gb), base address = 0, code read/exec, granularity = 4096, 386 */ - .word 0xFFFF, 0x00, 0x9A00, 0x00CF - /* 0x58 4Gb - (0x100000*0x1000 = 4Gb*), base address = 0, data read/write, granularity = 4096, 386 */ - .word 0xFFFF, 0x0000, 0x9200, 0x00CF - - - /* 0x60 4Gb - (0x100000*0x1000 = 4Gb), base address = 0, code read/exec, granularity = 4096, 386 */ - .word 0xFFFF, 0x00, 0x9A00, 0x00CF - /* 0x68 4Gb - (0x100000*0x1000 = 4Gb*), base address = 0, data read/write, granularity = 4096, 386 */ - .word 0xFFFF, 0x0000, 0x9200, 0x00CF -debug_gdt_end: - - -setup16_debug_kernel_pre_protected: - .code16 - DEBUG_CHAR('i') - cli # no interrupts allowed ! - movb $0x80, %al # disable NMI for bootup - # sequence - outb %al, $0x70 - lret -setup16_debug_first_code32: - .code32 - .byte 0xbf /* movl $0x12345678, %edi */ -location: - .long 0x12345678 - DEBUG_CHAR('j') - .byte 0xb8 /* movl $0x10000, %eax */ -setup16_debug_old_code32: - .long 0x10000 - jmp %eax -setup16_debug_end: -setup16_debug_size: - .long setup16_debug_end - setup16_debug_start -setup16_debug_align: - .long 16 |