mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-08-08 02:03:56 -06:00
* Updated fw_cfg option ROM to include DMA support
-----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAABCAAGBQJXh5jKAAoJEL/70l94x66DC3wIAJZ6QBdkeLc8J16dtCo6p6oR laxJm5NNPrqh/PgcQO+NEmqpPt4M3TuvTuOZuXXFqqW9F6d9QhIYqYhohSQgvu86 4ImunfjuVUHQqdDeHvDPLOHW61U2m9isoYRj+x06GORHUpNGsee31PsoDjHUxI9c Uea/lSkH86K0y/2RBVFTrGou0VZkOEtOrVb9W3B1Welg0qjs4BY8Yem8Y/vspTvA yxavGCyEO96trlhRIhwbcDU1u4AmunGRGCjIubFmXLNgPMaa49pGXtCfF30FxAen 0nBCRMhv2hs2V8bIxfVsNTR2NndvEuaT8uCMhYgTcZKShW6oDFQq/+bTYsN7krE= =oQEo -----END PGP SIGNATURE----- Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream-fwcfg' into staging * Updated fw_cfg option ROM to include DMA support # gpg: Signature made Thu 14 Jul 2016 14:51:06 BST # gpg: using RSA key 0xBFFBD25F78C7AE83 # gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" # gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" # Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1 # Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83 * remotes/bonzini/tags/for-upstream-fwcfg: Add optionrom compatible with fw_cfg DMA version Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell
commit
1c8e93fb41
10 changed files with 348 additions and 12 deletions
BIN
pc-bios/linuxboot_dma.bin
Normal file
BIN
pc-bios/linuxboot_dma.bin
Normal file
Binary file not shown.
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@ -9,22 +9,46 @@ $(call set-vpath, $(SRC_PATH)/pc-bios/optionrom)
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.PHONY : all clean build-all
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CFLAGS := -Wall -Wstrict-prototypes -Werror -fomit-frame-pointer -fno-builtin
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CFLAGS += -I$(SRC_PATH)
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CFLAGS += $(call cc-option, $(CFLAGS), -fno-stack-protector)
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CFLAGS += $(CFLAGS_NOPIE)
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QEMU_CFLAGS = $(CFLAGS)
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# Drop -fstack-protector and the like
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QEMU_CFLAGS := $(filter -W%, $(QEMU_CFLAGS)) $(CFLAGS_NOPIE) -ffreestanding
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QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -m16)
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ifeq ($(filter -m16, $(QEMU_CFLAGS)),)
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# Attempt to work around compilers that lack -m16 (GCC <= 4.8, clang <= ??)
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# On GCC we add -fno-toplevel-reorder to keep the order of asm blocks with
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# respect to the rest of the code. clang does not have -fno-toplevel-reorder,
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# but it places all asm blocks at the beginning and we're relying on it for
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# the option ROM header. So just force clang not to use the integrated
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# assembler, which doesn't support .code16gcc.
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QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-toplevel-reorder)
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QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -no-integrated-as)
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QEMU_CFLAGS += -m32 -include $(SRC_PATH)/pc-bios/optionrom/code16gcc.h
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endif
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build-all: multiboot.bin linuxboot.bin kvmvapic.bin
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# Drop gcov and glib flags
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CFLAGS := $(filter -O% -g%, $(CFLAGS))
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QEMU_INCLUDES += -I$(SRC_PATH)
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Wa = -Wa,
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ASFLAGS += -32
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QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), $(Wa)-32)
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build-all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin
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# suppress auto-removal of intermediate files
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.SECONDARY:
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%.o: %.S
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$(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_DGFLAGS) $(CFLAGS) -c -o - $< | $(AS) $(ASFLAGS) -o $@," AS $(TARGET_DIR)$@")
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$(call quiet-command,$(CPP) $(QEMU_INCLUDES) $(QEMU_DGFLAGS) -c -o - $< | $(AS) $(ASFLAGS) -o $@," AS $(TARGET_DIR)$@")
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ifdef CONFIG_WIN32
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LD_EMULATION = i386pe
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else
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LD_EMULATION = elf_i386
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endif
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%.img: %.o
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$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e _start -s -o $@ $<," Building $(TARGET_DIR)$@")
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$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m $(LD_EMULATION) -Ttext 0 -e _start -s -o $@ $<," Building $(TARGET_DIR)$@")
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%.raw: %.img
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$(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@," Building $(TARGET_DIR)$@")
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3
pc-bios/optionrom/code16gcc.h
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3
pc-bios/optionrom/code16gcc.h
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@ -0,0 +1,3 @@
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asm(
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".code16gcc\n"
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);
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294
pc-bios/optionrom/linuxboot_dma.c
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294
pc-bios/optionrom/linuxboot_dma.c
Normal file
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@ -0,0 +1,294 @@
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/*
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* Linux Boot Option ROM for fw_cfg DMA
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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 (c) 2015-2016 Red Hat Inc.
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* Authors:
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* Marc Marí <marc.mari.barcelo@gmail.com>
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* Richard W.M. Jones <rjones@redhat.com>
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*/
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asm(
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".text\n"
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".global _start\n"
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"_start:\n"
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" .short 0xaa55\n"
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" .byte 0\n" /* size in 512 units, filled in by signrom.py */
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" .byte 0xcb\n" /* far return without prefix */
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" .org 0x18\n"
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" .short 0\n"
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" .short _pnph\n"
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"_pnph:\n"
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" .ascii \"$PnP\"\n"
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" .byte 0x01\n"
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" .byte (_pnph_len / 16)\n"
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" .short 0x0000\n"
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" .byte 0x00\n"
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" .byte 0x00\n"
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" .long 0x00000000\n"
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" .short _manufacturer\n"
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" .short _product\n"
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" .long 0x00000000\n"
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" .short 0x0000\n"
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" .short 0x0000\n"
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" .short _bev\n"
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" .short 0x0000\n"
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" .short 0x0000\n"
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" .equ _pnph_len, . - _pnph\n"
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"_manufacturer:\n"
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" .asciz \"QEMU\"\n"
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"_product:\n"
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" .asciz \"Linux loader DMA\"\n"
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" .align 4, 0\n"
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"_bev:\n"
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" cli\n"
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" cld\n"
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" jmp load_kernel\n"
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);
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#include "../../include/hw/nvram/fw_cfg_keys.h"
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/* QEMU_CFG_DMA_CONTROL bits */
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#define BIOS_CFG_DMA_CTL_ERROR 0x01
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#define BIOS_CFG_DMA_CTL_READ 0x02
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#define BIOS_CFG_DMA_CTL_SKIP 0x04
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#define BIOS_CFG_DMA_CTL_SELECT 0x08
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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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#define uint64_t unsigned long long
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#define uint32_t unsigned int
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#define uint16_t unsigned short
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#define barrier() asm("" : : : "memory")
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typedef struct FWCfgDmaAccess {
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uint32_t control;
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uint32_t length;
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uint64_t address;
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} __attribute__((packed)) FWCfgDmaAccess;
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static inline void outl(uint32_t value, uint16_t port)
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{
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asm("outl %0, %w1" : : "a"(value), "Nd"(port));
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}
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static inline void set_es(void *addr)
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{
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uint32_t seg = (uint32_t)addr >> 4;
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asm("movl %0, %%es" : : "r"(seg));
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}
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#ifdef __clang__
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#define ADDR32
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#else
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#define ADDR32 "addr32 "
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#endif
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static inline uint16_t readw_es(uint16_t offset)
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{
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uint16_t val;
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asm(ADDR32 "movw %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
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barrier();
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return val;
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}
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static inline uint32_t readl_es(uint16_t offset)
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{
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uint32_t val;
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asm(ADDR32 "movl %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
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barrier();
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return val;
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}
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static inline void writel_es(uint16_t offset, uint32_t val)
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{
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barrier();
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asm(ADDR32 "movl %0, %%es:(%1)" : : "r"(val), "r"((uint32_t)offset));
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}
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static inline uint32_t bswap32(uint32_t x)
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{
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return
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((x & 0x000000ffU) << 24) |
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((x & 0x0000ff00U) << 8) |
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((x & 0x00ff0000U) >> 8) |
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((x & 0xff000000U) >> 24);
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}
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static inline uint64_t bswap64(uint64_t x)
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{
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return
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((x & 0x00000000000000ffULL) << 56) |
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((x & 0x000000000000ff00ULL) << 40) |
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((x & 0x0000000000ff0000ULL) << 24) |
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((x & 0x00000000ff000000ULL) << 8) |
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((x & 0x000000ff00000000ULL) >> 8) |
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((x & 0x0000ff0000000000ULL) >> 24) |
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((x & 0x00ff000000000000ULL) >> 40) |
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((x & 0xff00000000000000ULL) >> 56);
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}
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static inline uint64_t cpu_to_be64(uint64_t x)
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{
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return bswap64(x);
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}
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static inline uint32_t cpu_to_be32(uint32_t x)
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{
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return bswap32(x);
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}
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static inline uint32_t be32_to_cpu(uint32_t x)
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{
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return bswap32(x);
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}
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static void bios_cfg_read_entry(void *buf, uint16_t entry, uint32_t len)
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{
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FWCfgDmaAccess access;
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uint32_t control = (entry << 16) | BIOS_CFG_DMA_CTL_SELECT
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| BIOS_CFG_DMA_CTL_READ;
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access.address = cpu_to_be64((uint64_t)(uint32_t)buf);
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access.length = cpu_to_be32(len);
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access.control = cpu_to_be32(control);
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barrier();
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outl(cpu_to_be32((uint32_t)&access), BIOS_CFG_DMA_ADDR_LOW);
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while (be32_to_cpu(access.control) & ~BIOS_CFG_DMA_CTL_ERROR) {
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barrier();
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}
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}
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/* Return top of memory using BIOS function E801. */
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static uint32_t get_e801_addr(void)
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{
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uint16_t ax, bx, cx, dx;
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uint32_t ret;
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asm("int $0x15\n"
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: "=a"(ax), "=b"(bx), "=c"(cx), "=d"(dx)
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: "a"(0xe801), "b"(0), "c"(0), "d"(0));
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/* Not SeaBIOS, but in theory a BIOS could return CX=DX=0 in which
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* case we need to use the result from AX & BX instead.
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*/
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if (cx == 0 && dx == 0) {
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cx = ax;
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dx = bx;
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}
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if (dx) {
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/* DX = extended memory above 16M, in 64K units.
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* Convert it to bytes and return.
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*/
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ret = ((uint32_t)dx + 256 /* 16M in 64K units */) << 16;
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} else {
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/* This is a fallback path for machines with <= 16MB of RAM,
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* which probably would never be the case, but deal with it
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* anyway.
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*
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* CX = extended memory between 1M and 16M, in kilobytes
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* Convert it to bytes and return.
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*/
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ret = ((uint32_t)cx + 1024 /* 1M in K */) << 10;
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}
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return ret;
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}
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/* Force the asm name without leading underscore, even on Win32. */
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extern void load_kernel(void) asm("load_kernel");
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void load_kernel(void)
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{
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void *setup_addr;
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void *initrd_addr;
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void *kernel_addr;
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void *cmdline_addr;
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uint32_t setup_size;
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uint32_t initrd_size;
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uint32_t kernel_size;
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uint32_t cmdline_size;
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uint32_t initrd_end_page, max_allowed_page;
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uint32_t segment_addr, stack_addr;
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bios_cfg_read_entry(&setup_addr, FW_CFG_SETUP_ADDR, 4);
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bios_cfg_read_entry(&setup_size, FW_CFG_SETUP_SIZE, 4);
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bios_cfg_read_entry(setup_addr, FW_CFG_SETUP_DATA, setup_size);
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set_es(setup_addr);
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/* For protocol < 0x203 we don't have initrd_max ... */
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if (readw_es(0x206) < 0x203) {
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/* ... so we assume initrd_max = 0x37ffffff. */
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writel_es(0x22c, 0x37ffffff);
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}
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bios_cfg_read_entry(&initrd_addr, FW_CFG_INITRD_ADDR, 4);
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bios_cfg_read_entry(&initrd_size, FW_CFG_INITRD_SIZE, 4);
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initrd_end_page = ((uint32_t)(initrd_addr + initrd_size) & -4096);
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max_allowed_page = (readl_es(0x22c) & -4096);
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if (initrd_end_page != 0 && max_allowed_page != 0 &&
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initrd_end_page != max_allowed_page) {
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/* Initrd at the end of memory. Compute better initrd address
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* based on e801 data
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*/
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initrd_addr = (void *)((get_e801_addr() - initrd_size) & -4096);
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writel_es(0x218, (uint32_t)initrd_addr);
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}
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bios_cfg_read_entry(initrd_addr, FW_CFG_INITRD_DATA, initrd_size);
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bios_cfg_read_entry(&kernel_addr, FW_CFG_KERNEL_ADDR, 4);
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bios_cfg_read_entry(&kernel_size, FW_CFG_KERNEL_SIZE, 4);
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bios_cfg_read_entry(kernel_addr, FW_CFG_KERNEL_DATA, kernel_size);
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bios_cfg_read_entry(&cmdline_addr, FW_CFG_CMDLINE_ADDR, 4);
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bios_cfg_read_entry(&cmdline_size, FW_CFG_CMDLINE_SIZE, 4);
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bios_cfg_read_entry(cmdline_addr, FW_CFG_CMDLINE_DATA, cmdline_size);
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/* Boot linux */
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segment_addr = ((uint32_t)setup_addr >> 4);
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stack_addr = (uint32_t)(cmdline_addr - setup_addr - 16);
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/* As we are changing critical registers, we cannot leave freedom to the
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* compiler.
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*/
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asm("movw %%ax, %%ds\n"
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"movw %%ax, %%es\n"
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"movw %%ax, %%fs\n"
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"movw %%ax, %%gs\n"
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"movw %%ax, %%ss\n"
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"movl %%ebx, %%esp\n"
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"addw $0x20, %%ax\n"
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"pushw %%ax\n" /* CS */
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"pushw $0\n" /* IP */
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/* Clear registers and jump to Linux */
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"xor %%ebx, %%ebx\n"
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"xor %%ecx, %%ecx\n"
|
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"xor %%edx, %%edx\n"
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"xor %%edi, %%edi\n"
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"xor %%ebp, %%ebp\n"
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"lretw\n"
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: : "a"(segment_addr), "b"(stack_addr));
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}
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