| /* |
| * (C) Copyright 2002 |
| * Daniel Engström, Omicron Ceti AB, daniel@omicron.se |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * 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; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| /* |
| * x86 realmode assembly implementation of a PCI BIOS |
| * for platforms that use one PCI hose and configuration |
| * access type 1. (The common case for low-end PC's) |
| */ |
| |
| #include "bios.h" |
| |
| #define PCI_BIOS_DEBUG |
| |
| .section .bios, "ax" |
| .code16 |
| .globl realmode_pci_bios_call_entry |
| realmode_pci_bios_call_entry: |
| MAKE_BIOS_STACK |
| call realmode_pci_bios |
| RESTORE_CALLERS_STACK |
| ret |
| |
| |
| .globl realmode_pci_bios |
| realmode_pci_bios: |
| gs movw OFFS_AX(%bp), %ax |
| cmpb $1, %al |
| je pci_bios_present |
| cmpb $2, %al |
| je pci_bios_find_device |
| cmpb $3, %al |
| je pci_bios_find_class |
| cmpb $6, %al |
| je pci_bios_generate_special_cycle |
| cmpb $8, %al |
| je pci_bios_read_cfg_byte |
| cmpb $9, %al |
| je pci_bios_read_cfg_word |
| cmpb $10, %al |
| je pci_bios_read_cfg_dword |
| cmpb $11, %al |
| je pci_bios_write_cfg_byte |
| cmpb $12, %al |
| je pci_bios_write_cfg_word |
| cmpb $13, %al |
| je pci_bios_write_cfg_dword |
| cmpb $14, %al |
| je pci_bios_get_irq_routing |
| cmpb $15, %al |
| je pci_bios_set_irq |
| jmp unknown_function |
| |
| /*****************************************************************************/ |
| |
| pci_bios_present: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_present |
| #endif |
| movl $0x20494350, %eax |
| gs movl %eax, OFFS_EDX(%bp) |
| movb $0x01, %al |
| gs movb %al, OFFS_AL(%bp) /* We support cfg type 1 */ |
| movw $0x0210, %ax /* version 2.10 */ |
| gs movw %ax, OFFS_BX(%bp) |
| cs movb pci_last_bus, %al /* last bus number */ |
| gs movb %al, OFFS_CL(%bp) |
| jmp clear_carry |
| |
| /*****************************************************************************/ |
| |
| /* device 0-31, function 0-7 */ |
| pci_bios_find_device: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_find_device |
| #endif |
| gs movw OFFS_CX(%bp), %di |
| shll $16, %edi |
| gs movw OFFS_DX(%bp), %di /* edi now holds device in upper 16 |
| * bits and vendor in lower 16 bits */ |
| gs movw OFFS_SI(%bp), %si |
| xorw %bx, %bx /* start at bus 0 dev 0 function 0 */ |
| pfd_loop: |
| xorw %ax, %ax /* dword 0 is vendor/device */ |
| call __pci_bios_select_register |
| movw $0xcfc, %dx |
| inl %dx, %eax |
| cmpl %edi, %eax /* our device ? */ |
| je pfd_found_one |
| pfd_next_dev: |
| /* check for multi function devices */ |
| movw %bx, %ax |
| andw $3, %ax |
| jnz pfd_function_not_zero |
| movw $0x000c, %ax |
| call __pci_bios_select_register |
| movw $0xcfe, %dx |
| inb %dx, %al |
| andb $0x80, %al |
| jz pfd_not_multi_function |
| pfd_function_not_zero: |
| incw %bx /* next function, overflows in to |
| * device number, then bus number */ |
| jmp pfd_check_bus |
| |
| pfd_not_multi_function: |
| andw $0xfff8, %bx /* remove function bits */ |
| addw $0x0008, %bx /* next device, overflows in to bus number */ |
| pfd_check_bus: |
| cs movb pci_last_bus, %ah |
| cmpb %ah, %bh |
| ja pfd_not_found |
| jmp pfd_loop |
| pfd_found_one: |
| decw %si |
| js pfd_done |
| jmp pfd_next_dev |
| |
| pfd_done: |
| gs movw %bx, OFFS_BX(%bp) |
| jmp clear_carry |
| |
| pfd_not_found: |
| movb $0x86, %ah /* device not found */ |
| jmp set_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_find_class: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_find_class |
| #endif |
| gs movl OFFS_ECX(%bp), %edi |
| andl $0x00ffffff, %edi /* edi now holds class-code in lower 24 bits */ |
| gs movw OFFS_SI(%bp), %si |
| xorw %bx, %bx /* start at bus 0 dev 0 function 0 */ |
| pfc_loop: |
| movw $8, %ax /* dword 8 is class-code high 24bits */ |
| call __pci_bios_select_register |
| movw $0xcfc, %dx |
| inl %dx, %eax |
| shrl $8, %eax |
| andl $0x00ffffff, %eax |
| cmpl %edi, %eax /* our device ? */ |
| je pfc_found_one |
| pfc_next_dev: |
| /* check for multi function devices */ |
| andw $3, %bx |
| jnz pfc_function_not_zero |
| movw $0x000c, %ax |
| call __pci_bios_select_register |
| movw $0xcfe, %dx |
| inb %dx, %al |
| andb $0x80, %al |
| jz pfc_not_multi_function |
| pfc_function_not_zero: |
| incw %bx /* next function, overflows in to |
| * device number, then bus number */ |
| jmp pfc_check_bus |
| |
| pfc_not_multi_function: |
| andw $0xfff8, %bx /* remove function bits */ |
| addw $0x0008, %bx /* next device, overflows in to bus number */ |
| pfc_check_bus: |
| cs movb pci_last_bus, %ah |
| cmpb %ah, %bh |
| ja pfc_not_found |
| jmp pfc_loop |
| pfc_found_one: |
| decw %si |
| js pfc_done |
| jmp pfc_next_dev |
| |
| pfc_done: |
| gs movw %bx, OFFS_BX(%bp) |
| jmp clear_carry |
| |
| pfc_not_found: |
| movb $0x86, %ah /* device not found */ |
| jmp set_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_generate_special_cycle: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_generate_special_cycle |
| #endif |
| movb $0x81, %ah /* function not supported */ |
| jmp set_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_read_cfg_byte: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_read_cfg_byte |
| #endif |
| call pci_bios_select_register |
| gs movw OFFS_DI(%bp), %dx |
| andw $3, %dx |
| addw $0xcfc, %dx |
| inb %dx, %al |
| gs movb %al, OFFS_CL(%bp) |
| jmp clear_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_read_cfg_word: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_read_cfg_word |
| #endif |
| call pci_bios_select_register |
| gs movw OFFS_DI(%bp), %dx |
| andw $2, %dx |
| addw $0xcfc, %dx |
| inw %dx, %ax |
| gs movw %ax, OFFS_CX(%bp) |
| jmp clear_carry |
| |
| |
| /*****************************************************************************/ |
| |
| pci_bios_read_cfg_dword: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_read_cfg_dword |
| #endif |
| call pci_bios_select_register |
| movw $0xcfc, %dx |
| inl %dx, %eax |
| gs movl %eax, OFFS_ECX(%bp) |
| jmp clear_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_write_cfg_byte: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_write_cfg_byte |
| #endif |
| call pci_bios_select_register |
| gs movw OFFS_DI(%bp), %dx |
| gs movb OFFS_CL(%bp), %al |
| andw $3, %dx |
| addw $0xcfc, %dx |
| outb %al, %dx |
| jmp clear_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_write_cfg_word: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_write_cfg_word |
| #endif |
| call pci_bios_select_register |
| gs movw OFFS_DI(%bp), %dx |
| gs movw OFFS_CX(%bp), %ax |
| andw $2, %dx |
| addw $0xcfc, %dx |
| outw %ax, %dx |
| jmp clear_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_write_cfg_dword: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_write_cfg_dword |
| #endif |
| call pci_bios_select_register |
| gs movl OFFS_ECX(%bp), %eax |
| movw $0xcfc, %dx |
| outl %eax, %dx |
| jmp clear_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_get_irq_routing: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_get_irq_routing |
| #endif |
| movb $0x81, %ah /* function not supported */ |
| jmp set_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_set_irq: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_set_irq |
| #endif |
| movb $0x81, %ah /* function not supported */ |
| jmp set_carry |
| |
| /*****************************************************************************/ |
| |
| unknown_function: |
| #ifdef PCI_BIOS_DEBUG |
| cs incl num_pci_bios_unknown_function |
| #endif |
| movb $0x81, %ah /* function not supported */ |
| jmp set_carry |
| |
| /*****************************************************************************/ |
| |
| pci_bios_select_register: |
| gs movw OFFS_BX(%bp), %bx |
| gs movw OFFS_DI(%bp), %ax |
| /* destroys eax, dx */ |
| __pci_bios_select_register: /* BX holds device id, AX holds register index */ |
| pushl %ebx |
| andl $0xfc, %eax |
| andl $0xffff, %ebx |
| shll $8, %ebx |
| orl %ebx, %eax |
| orl $0x80000000, %eax |
| movw $0xcf8, %dx |
| outl %eax, %dx |
| popl %ebx |
| ret |
| |
| |
| clear_carry: |
| gs movw OFFS_FLAGS(%bp), %ax |
| andw $0xfffe, %ax /* clear carry -- function succeeded */ |
| gs movw %ax, OFFS_FLAGS(%bp) |
| xorw %ax, %ax |
| gs movb %ah, OFFS_AH(%bp) |
| ret |
| |
| set_carry: |
| gs movb %ah, OFFS_AH(%bp) |
| gs movw OFFS_FLAGS(%bp), %ax |
| orw $1, %ax /* return carry -- function not supported */ |
| gs movw %ax, OFFS_FLAGS(%bp) |
| movw $-1, %ax |
| ret |
| |
| /*****************************************************************************/ |
| |
| .globl pci_last_bus |
| pci_last_bus: |
| .byte 0 |
| |
| #ifdef PCI_BIOS_DEBUG |
| .globl num_pci_bios_present |
| num_pci_bios_present: |
| .long 0 |
| |
| .globl num_pci_bios_find_device |
| num_pci_bios_find_device: |
| .long 0 |
| |
| .globl num_pci_bios_find_class |
| num_pci_bios_find_class: |
| .long 0 |
| |
| .globl num_pci_bios_generate_special_cycle |
| num_pci_bios_generate_special_cycle: |
| .long 0 |
| |
| .globl num_pci_bios_read_cfg_byte |
| num_pci_bios_read_cfg_byte: |
| .long 0 |
| |
| .globl num_pci_bios_read_cfg_word |
| num_pci_bios_read_cfg_word: |
| .long 0 |
| |
| .globl num_pci_bios_read_cfg_dword |
| num_pci_bios_read_cfg_dword: |
| .long 0 |
| |
| .globl num_pci_bios_write_cfg_byte |
| num_pci_bios_write_cfg_byte: |
| .long 0 |
| |
| .globl num_pci_bios_write_cfg_word |
| num_pci_bios_write_cfg_word: |
| .long 0 |
| |
| .globl num_pci_bios_write_cfg_dword |
| num_pci_bios_write_cfg_dword: |
| .long 0 |
| |
| .globl num_pci_bios_get_irq_routing |
| num_pci_bios_get_irq_routing: |
| .long 0 |
| |
| .globl num_pci_bios_set_irq |
| num_pci_bios_set_irq: |
| .long 0 |
| |
| .globl num_pci_bios_unknown_function |
| num_pci_bios_unknown_function: |
| .long 0 |
| #endif |
