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48972f8cad
Add a new option rom for the multiboot loader, using DMA transfers to copy data instead of "rep insb". This significantly lowers QEMU's startup latency by a factor of about 40, for example, going from 30sec to 0.8sec when loading modules of 120MB in size. Signed-off-by: Marcus Hähnel <marcus.haehnel@kernkonzept.com> Signed-off-by: Adam Lackorzynski <adam@l4re.org> [Modified to keep the non-DMA code depending on #ifdef USE_FW_CFG_DMA; do not write below stack. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
231 lines
5.6 KiB
C
231 lines
5.6 KiB
C
/*
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* Common Option ROM Functions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright Novell Inc, 2009
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* Authors: Alexander Graf <agraf@suse.de>
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*/
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#define FW_CFG_KERNEL_ADDR 0x07
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#define FW_CFG_KERNEL_SIZE 0x08
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#define FW_CFG_KERNEL_CMDLINE 0x09
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#define FW_CFG_INITRD_ADDR 0x0a
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#define FW_CFG_INITRD_SIZE 0x0b
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#define FW_CFG_KERNEL_ENTRY 0x10
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#define FW_CFG_KERNEL_DATA 0x11
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#define FW_CFG_INITRD_DATA 0x12
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#define FW_CFG_CMDLINE_ADDR 0x13
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#define FW_CFG_CMDLINE_SIZE 0x14
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#define FW_CFG_CMDLINE_DATA 0x15
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#define FW_CFG_SETUP_ADDR 0x16
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#define FW_CFG_SETUP_SIZE 0x17
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#define FW_CFG_SETUP_DATA 0x18
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#define BIOS_CFG_IOPORT_CFG 0x510
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#define BIOS_CFG_IOPORT_DATA 0x511
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#define FW_CFG_DMA_CTL_ERROR 0x01
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#define FW_CFG_DMA_CTL_READ 0x02
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#define FW_CFG_DMA_CTL_SKIP 0x04
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#define FW_CFG_DMA_CTL_SELECT 0x08
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#define FW_CFG_DMA_CTL_WRITE 0x10
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#define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */
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#define BIOS_CFG_DMA_ADDR_HIGH 0x514
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#define BIOS_CFG_DMA_ADDR_LOW 0x518
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/* Break the translation block flow so -d cpu shows us values */
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#define DEBUG_HERE \
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jmp 1f; \
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1:
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/*
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* Read a variable from the fw_cfg device.
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* Clobbers: %edx
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* Out: %eax
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*/
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.macro read_fw VAR
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mov $\VAR, %ax
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mov $BIOS_CFG_IOPORT_CFG, %dx
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outw %ax, (%dx)
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mov $BIOS_CFG_IOPORT_DATA, %dx
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inb (%dx), %al
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shl $8, %eax
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inb (%dx), %al
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shl $8, %eax
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inb (%dx), %al
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shl $8, %eax
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inb (%dx), %al
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bswap %eax
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.endm
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/*
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* Read data from the fw_cfg device using DMA.
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* Clobbers: %edx, %eax, ADDR, SIZE, memory[%esp-16] to memory[%esp]
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*/
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.macro read_fw_dma VAR, SIZE, ADDR
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/* Address */
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bswapl \ADDR
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pushl \ADDR
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/* We only support 32 bit target addresses */
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xorl %eax, %eax
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pushl %eax
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mov $BIOS_CFG_DMA_ADDR_HIGH, %dx
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outl %eax, (%dx)
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/* Size */
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bswapl \SIZE
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pushl \SIZE
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/* Control */
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movl $(\VAR << 16) | (FW_CFG_DMA_CTL_READ | FW_CFG_DMA_CTL_SELECT), %eax
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bswapl %eax
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pushl %eax
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movl %esp, %eax /* Address of the struct we generated */
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bswapl %eax
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mov $BIOS_CFG_DMA_ADDR_LOW, %dx
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outl %eax, (%dx) /* Initiate DMA */
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1: mov (%esp), %eax /* Wait for completion */
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bswapl %eax
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testl $~FW_CFG_DMA_CTL_ERROR, %eax
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jnz 1b
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addl $16, %esp
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.endm
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/*
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* Read a blob from the fw_cfg device using DMA
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* Requires _ADDR, _SIZE and _DATA values for the parameter.
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*
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* Clobbers: %eax, %edx, %es, %ecx, %edi and adresses %esp-20 to %esp
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*/
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#ifdef USE_FW_CFG_DMA
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#define read_fw_blob_dma(var) \
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read_fw var ## _SIZE; \
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mov %eax, %ecx; \
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read_fw var ## _ADDR; \
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mov %eax, %edi ;\
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read_fw_dma var ## _DATA, %ecx, %edi
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#else
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#define read_fw_blob_dma(var) read_fw_blob(var)
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#endif
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#define read_fw_blob_pre(var) \
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read_fw var ## _SIZE; \
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mov %eax, %ecx; \
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mov $var ## _DATA, %ax; \
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mov $BIOS_CFG_IOPORT_CFG, %edx; \
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outw %ax, (%dx); \
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mov $BIOS_CFG_IOPORT_DATA, %dx; \
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cld
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/*
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* Read a blob from the fw_cfg device.
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* Requires _ADDR, _SIZE and _DATA values for the parameter.
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*
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* Clobbers: %eax, %edx, %es, %ecx, %edi
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*/
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#define read_fw_blob(var) \
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read_fw var ## _ADDR; \
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mov %eax, %edi; \
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read_fw_blob_pre(var); \
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/* old as(1) doesn't like this insn so emit the bytes instead: \
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rep insb (%dx), %es:(%edi); \
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*/ \
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.dc.b 0xf3,0x6c
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/*
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* Read a blob from the fw_cfg device in forced addr32 mode.
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* Requires _ADDR, _SIZE and _DATA values for the parameter.
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*
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* Clobbers: %eax, %edx, %es, %ecx, %edi
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*/
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#define read_fw_blob_addr32(var) \
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read_fw var ## _ADDR; \
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mov %eax, %edi; \
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read_fw_blob_pre(var); \
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/* old as(1) doesn't like this insn so emit the bytes instead: \
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addr32 rep insb (%dx), %es:(%edi); \
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*/ \
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.dc.b 0x67,0xf3,0x6c
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/*
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* Read a blob from the fw_cfg device in forced addr32 mode, address is in %edi.
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* Requires _SIZE and _DATA values for the parameter.
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*
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* Clobbers: %eax, %edx, %edi, %es, %ecx
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*/
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#define read_fw_blob_addr32_edi(var) \
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read_fw_blob_pre(var); \
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/* old as(1) doesn't like this insn so emit the bytes instead: \
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addr32 rep insb (%dx), %es:(%edi); \
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*/ \
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.dc.b 0x67,0xf3,0x6c
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#define OPTION_ROM_START \
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.code16; \
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.text; \
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.global _start; \
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_start:; \
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.short 0xaa55; \
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.byte (_end - _start) / 512;
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#define BOOT_ROM_START \
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OPTION_ROM_START \
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lret; \
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.org 0x18; \
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.short 0; \
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.short _pnph; \
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_pnph: \
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.ascii "$PnP"; \
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.byte 0x01; \
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.byte ( _pnph_len / 16 ); \
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.short 0x0000; \
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.byte 0x00; \
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.byte 0x00; \
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.long 0x00000000; \
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.short _manufacturer; \
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.short _product; \
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.long 0x00000000; \
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.short 0x0000; \
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.short 0x0000; \
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.short _bev; \
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.short 0x0000; \
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.short 0x0000; \
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.equ _pnph_len, . - _pnph; \
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_bev:; \
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/* DS = CS */ \
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movw %cs, %ax; \
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movw %ax, %ds;
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#define OPTION_ROM_END \
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.byte 0; \
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.align 512, 0; \
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_end:
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#define BOOT_ROM_END \
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_manufacturer:; \
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.asciz "QEMU"; \
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_product:; \
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.asciz BOOT_ROM_PRODUCT; \
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OPTION_ROM_END
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