diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/i386/prefix/mromprefix.S')
| -rw-r--r-- | qemu/roms/ipxe/src/arch/i386/prefix/mromprefix.S | 516 |
1 files changed, 0 insertions, 516 deletions
diff --git a/qemu/roms/ipxe/src/arch/i386/prefix/mromprefix.S b/qemu/roms/ipxe/src/arch/i386/prefix/mromprefix.S deleted file mode 100644 index b636b92af..000000000 --- a/qemu/roms/ipxe/src/arch/i386/prefix/mromprefix.S +++ /dev/null @@ -1,516 +0,0 @@ -/* - * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>. - * - * 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 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., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - * - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ) - -#define PCIBIOS_READ_CONFIG_WORD 0xb109 -#define PCIBIOS_READ_CONFIG_DWORD 0xb10a -#define PCIBIOS_WRITE_CONFIG_WORD 0xb10c -#define PCIBIOS_WRITE_CONFIG_DWORD 0xb10d -#define PCI_COMMAND 0x04 -#define PCI_COMMAND_MEM 0x02 -#define PCI_BAR_0 0x10 -#define PCI_BAR_5 0x24 -#define PCI_BAR_EXPROM 0x30 - -#define PCIR_SIGNATURE ( 'P' + ( 'C' << 8 ) + ( 'I' << 16 ) + ( 'R' << 24 ) ) - -#define ROMPREFIX_EXCLUDE_PAYLOAD 1 -#define ROMPREFIX_MORE_IMAGES 1 -#define _pcirom_start _mrom_start -#include "pciromprefix.S" - - .text - .arch i386 - .code16 - -/* Obtain access to payload by exposing the expansion ROM BAR at the - * address currently used by a suitably large memory BAR on the same - * device. The memory BAR is temporarily disabled. Using a memory - * BAR on the same device means that we don't have to worry about the - * configuration of any intermediate PCI bridges. - * - * Parameters: - * %ds:0000 : Prefix - * %esi : Buffer for copy of image source (or zero if no buffer available) - * %ecx : Expected offset within buffer of first payload block - * Returns: - * %esi : Valid image source address (buffered or unbuffered) - * %ecx : Actual offset within buffer of first payload block - * CF set on error - */ - .section ".text16.early", "awx", @progbits - .globl open_payload -open_payload: - /* Preserve registers */ - pushl %eax - pushw %bx - pushl %edx - pushl %edi - pushw %bp - pushw %es - pushw %ds - - /* Retrieve bus:dev.fn from .prefix */ - movw init_pci_busdevfn, %bx - - /* Set up %ds for access to .text16.early */ - pushw %cs - popw %ds - - /* Set up %es for access to flat address space */ - xorw %ax, %ax - movw %ax, %es - - /* Store bus:dev.fn to .text16.early */ - movw %bx, payload_pci_busdevfn - - /* Get expansion ROM BAR current value */ - movw $PCI_BAR_EXPROM, %di - call pci_read_bar - movl %eax, rom_bar_orig_value - - /* Get expansion ROM BAR size */ - call pci_size_mem_bar_low - movl %ecx, rom_bar_size - - /* Find a suitable memory BAR to use */ - movw $PCI_BAR_0, %di /* %di is PCI BAR register */ - xorw %bp, %bp /* %bp is increment */ -find_mem_bar: - /* Move to next BAR */ - addw %bp, %di - cmpw $PCI_BAR_5, %di - jle 1f - stc - movl $0xbabababa, %esi /* Report "No suitable BAR" */ - movl rom_bar_size, %ecx - jmp 99f -1: movw $4, %bp - - /* Get BAR current value */ - call pci_read_bar - - /* Skip non-existent BARs */ - notl %eax - testl %eax, %eax - notl %eax - jz find_mem_bar - - /* Skip I/O BARs */ - testb $0x01, %al - jnz find_mem_bar - - /* Set increment to 8 for 64-bit BARs */ - testb $0x04, %al - jz 1f - movw $8, %bp -1: - /* Skip 64-bit BARs with high dword set; we couldn't use this - * address for the (32-bit) expansion ROM BAR anyway - */ - testl %edx, %edx - jnz find_mem_bar - - /* Get low dword of BAR size */ - call pci_size_mem_bar_low - - /* Skip BARs smaller than the expansion ROM BAR */ - cmpl %ecx, rom_bar_size - ja find_mem_bar - - /* We have a memory BAR with a 32-bit address that is large - * enough to use. Store BAR number and original value. - */ - movw %di, stolen_bar_register - movl %eax, stolen_bar_orig_value - - /* Remove flags from BAR address */ - xorb %al, %al - - /* Write zero to our stolen BAR. This doesn't technically - * disable it, but it's a pretty safe bet that the PCI bridge - * won't pass through accesses to this region anyway. Note - * that the high dword (if any) must already be zero. - */ - xorl %ecx, %ecx - call pci_write_config_dword - - /* Enable expansion ROM BAR at stolen BAR's address */ - movl %eax, %ecx - orb $0x1, %cl - movw $PCI_BAR_EXPROM, %di - call pci_write_config_dword - - /* Locate our ROM image */ -1: movl $0xaa55, %ecx /* 55aa signature */ - addr32 es cmpw %cx, (%eax) - jne 2f - movl $PCIR_SIGNATURE, %ecx /* PCIR signature */ - addr32 es movzwl 0x18(%eax), %edx - addr32 es cmpl %ecx, (%eax,%edx) - jne 2f - addr32 es cmpl $_build_id, build_id(%eax) /* iPXE build ID */ - je 3f - movl $0x80, %ecx /* Last image */ - addr32 es testb %cl, 0x15(%eax,%edx) - jnz 2f - addr32 es movzwl 0x10(%eax,%edx), %ecx /* PCIR image length */ - shll $9, %ecx - addl %ecx, %eax - jmp 1b -2: /* Failure */ - stc - movl %eax, %esi /* Report failure address */ - jmp 99f -3: - - /* Copy payload to buffer, or set buffer address to BAR address */ - testl %esi, %esi - jz 1f - /* We have a buffer; copy payload to it. Since .mrom is - * designed specifically for real hardware, we assume that - * flat real mode is working properly. (In the unlikely event - * that this code is run inside a hypervisor that doesn't - * properly support flat real mode, it will die horribly.) - */ - pushl %esi - movl %esi, %edi - movl %eax, %esi - addr32 es movzbl 2(%esi), %ecx - shll $7, %ecx - addr32 es movzwl mpciheader_image_length(%esi,%ecx,4), %edx - shll $7, %edx - addl %edx, %ecx - addr32 es rep movsl - popl %esi - jmp 2f -1: /* We have no buffer; set %esi to the BAR address */ - movl %eax, %esi -2: - - /* Locate first payload block (after the dummy ROM header) */ - addr32 es movzbl 2(%esi), %ecx - shll $9, %ecx - addl $_pprefix_skip, %ecx - - clc - /* Restore registers and return */ -99: popw %ds - popw %es - popw %bp - popl %edi - popl %edx - popw %bx - popl %eax - lret - .size open_payload, . - open_payload - - .section ".text16.early.data", "aw", @progbits -payload_pci_busdevfn: - .word 0 - .size payload_pci_busdevfn, . - payload_pci_busdevfn - - .section ".text16.early.data", "aw", @progbits -rom_bar_orig_value: - .long 0 - .size rom_bar_orig_value, . - rom_bar_orig_value - - .section ".text16.early.data", "aw", @progbits -rom_bar_size: - .long 0 - .size rom_bar_size, . - rom_bar_size - - .section ".text16.early.data", "aw", @progbits -stolen_bar_register: - .word 0 - .size stolen_bar_register, . - stolen_bar_register - - .section ".text16.early.data", "aw", @progbits -stolen_bar_orig_value: - .long 0 - .size stolen_bar_orig_value, . - stolen_bar_orig_value - -/* Restore original BAR values - * - * Parameters: - * none - * Returns: - * none - */ - .section ".text16.early", "awx", @progbits - .globl close_payload -close_payload: - /* Preserve registers */ - pushw %bx - pushw %di - pushl %ecx - pushw %ds - - /* Set up %ds for access to .text16.early */ - pushw %cs - popw %ds - - /* Retrieve stored bus:dev.fn */ - movw payload_pci_busdevfn, %bx - - /* Restore expansion ROM BAR original value */ - movw $PCI_BAR_EXPROM, %di - movl rom_bar_orig_value, %ecx - call pci_write_config_dword - - /* Restore stolen BAR original value */ - movw stolen_bar_register, %di - movl stolen_bar_orig_value, %ecx - call pci_write_config_dword - - /* Restore registers and return */ - popw %ds - popl %ecx - popw %di - popw %bx - lret - .size close_payload, . - close_payload - -/* Get PCI BAR value - * - * Parameters: - * %bx : PCI bus:dev.fn - * %di : PCI BAR register number - * Returns: - * %edx:%eax : PCI BAR value - */ - .section ".text16.early", "awx", @progbits -pci_read_bar: - /* Preserve registers */ - pushl %ecx - pushw %di - - /* Read low dword value */ - call pci_read_config_dword - movl %ecx, %eax - - /* Read high dword value, if applicable */ - xorl %edx, %edx - andb $0x07, %cl - cmpb $0x04, %cl - jne 1f - addw $4, %di - call pci_read_config_dword - movl %ecx, %edx -1: - /* Restore registers and return */ - popw %di - popl %ecx - ret - .size pci_read_bar, . - pci_read_bar - -/* Get low dword of PCI memory BAR size - * - * Parameters: - * %bx : PCI bus:dev.fn - * %di : PCI BAR register number - * %eax : Low dword of current PCI BAR value - * Returns: - * %ecx : PCI BAR size - */ - .section ".text16.early", "awx", @progbits -pci_size_mem_bar_low: - /* Preserve registers */ - pushw %dx - - /* Disable memory accesses */ - xorw %dx, %dx - call pci_set_mem_access - - /* Write all ones to BAR */ - xorl %ecx, %ecx - decl %ecx - call pci_write_config_dword - - /* Read back BAR */ - call pci_read_config_dword - - /* Calculate size */ - notl %ecx - orb $0x0f, %cl - incl %ecx - - /* Restore original value */ - pushl %ecx - movl %eax, %ecx - call pci_write_config_dword - popl %ecx - - /* Enable memory accesses */ - movw $PCI_COMMAND_MEM, %dx - call pci_set_mem_access - - /* Restore registers and return */ - popw %dx - ret - .size pci_size_mem_bar_low, . - pci_size_mem_bar_low - -/* Read PCI config dword - * - * Parameters: - * %bx : PCI bus:dev.fn - * %di : PCI register number - * Returns: - * %ecx : Dword value - */ - .section ".text16.early", "awx", @progbits -pci_read_config_dword: - /* Preserve registers */ - pushl %eax - pushl %ebx - pushl %edx - - /* Issue INT 0x1a,b10a */ - movw $PCIBIOS_READ_CONFIG_DWORD, %ax - int $0x1a - - /* Restore registers and return */ - popl %edx - popl %ebx - popl %eax - ret - .size pci_read_config_dword, . - pci_read_config_dword - -/* Write PCI config dword - * - * Parameters: - * %bx : PCI bus:dev.fn - * %di : PCI register number - * %ecx : PCI BAR value - * Returns: - * none - */ - .section ".text16.early", "awx", @progbits -pci_write_config_dword: - /* Preserve registers */ - pushal - - /* Issue INT 0x1a,b10d */ - movw $PCIBIOS_WRITE_CONFIG_DWORD, %ax - int $0x1a - - /* Restore registers and return */ - popal - ret - .size pci_write_config_dword, . - pci_write_config_dword - -/* Enable/disable memory access response in PCI command word - * - * Parameters: - * %bx : PCI bus:dev.fn - * %dx : PCI_COMMAND_MEM, or zero - * Returns: - * none - */ - .section ".text16.early", "awx", @progbits -pci_set_mem_access: - /* Preserve registers */ - pushal - - /* Read current value of command register */ - pushw %bx - pushw %dx - movw $PCI_COMMAND, %di - movw $PCIBIOS_READ_CONFIG_WORD, %ax - int $0x1a - popw %dx - popw %bx - - /* Set memory access enable as appropriate */ - andw $~PCI_COMMAND_MEM, %cx - orw %dx, %cx - - /* Write new value of command register */ - movw $PCIBIOS_WRITE_CONFIG_WORD, %ax - int $0x1a - - /* Restore registers and return */ - popal - ret - .size pci_set_mem_access, . - pci_set_mem_access - -/* Payload prefix - * - * We include a dummy ROM header to cover the "hidden" portion of the - * overall ROM image. - */ - .globl _payload_align - .equ _payload_align, 512 - .section ".pprefix", "ax", @progbits - .org 0x00 -mromheader: - .word 0xaa55 /* BIOS extension signature */ - .byte 0x01 /* Dummy size (BIOS bug workaround) */ - .org 0x18 - .word mpciheader - .org 0x1a - .word 0 - .size mromheader, . - mromheader - -mpciheader: - .ascii "PCIR" /* Signature */ - .word pci_vendor_id /* Vendor identification */ - .word pci_device_id /* Device identification */ - .word 0x0000 /* Device list pointer */ - .word mpciheader_len /* PCI data structure length */ - .byte 0x03 /* PCI data structure revision */ - .byte 0x02, 0x00, 0x00 /* Class code */ -mpciheader_image_length: - .word 0 /* Image length */ - .word 0x0001 /* Revision level */ - .byte 0xff /* Code type */ - .byte 0x80 /* Last image indicator */ -mpciheader_runtime_length: - .word 0 /* Maximum run-time image length */ - .word 0x0000 /* Configuration utility code header */ - .word 0x0000 /* DMTF CLP entry point */ - .equ mpciheader_len, . - mpciheader - .size mpciheader, . - mpciheader - - .section ".zinfo.fixup", "a", @progbits /* Compressor fixups */ - .ascii "APPW" - .long mpciheader_image_length - .long 512 - .long 0 - .ascii "APPW" - .long mpciheader_runtime_length - .long 512 - .long 0 - .previous - -/* Fix up additional image source size - * - */ - .section ".zinfo.fixup", "a", @progbits /* Compressor fixups */ - .ascii "ADPW" - .long extra_size - .long 512 - .long 0 - .previous |