This optionrom is based on linuxboot.S.
Added changes proposed by Gerd Hoffman, Stefan Hajnoczi and Kevin O'Connor.
All optionroms are now compiled in 32 bits. This also forces to not use any
standard C header because this would need cross-compiling support check and a
big modification on the configuration script.
Signed-off-by: Marc Marí <mar...@redhat.com>
---
.gitignore | 4 +
hw/i386/pc.c | 9 +-
hw/nvram/fw_cfg.c | 2 +-
include/hw/nvram/fw_cfg.h | 1 +
pc-bios/optionrom/Makefile | 7 +-
pc-bios/optionrom/linuxboot_dma.c | 288 ++++++++++++++++++++++++++++++++++++++
6 files changed, 306 insertions(+), 5 deletions(-)
create mode 100644 pc-bios/optionrom/linuxboot_dma.c
diff --git a/.gitignore b/.gitignore
index 88a80ff..101d1e0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -94,6 +94,10 @@
/pc-bios/optionrom/linuxboot.bin
/pc-bios/optionrom/linuxboot.raw
/pc-bios/optionrom/linuxboot.img
+/pc-bios/optionrom/linuxboot_dma.asm
+/pc-bios/optionrom/linuxboot_dma.bin
+/pc-bios/optionrom/linuxboot_dma.raw
+/pc-bios/optionrom/linuxboot_dma.img
/pc-bios/optionrom/multiboot.asm
/pc-bios/optionrom/multiboot.bin
/pc-bios/optionrom/multiboot.raw
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 459260b..00339fa 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1007,8 +1007,13 @@ static void load_linux(PCMachineState *pcms,
fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_SIZE, setup_size);
fw_cfg_add_bytes(fw_cfg, FW_CFG_SETUP_DATA, setup, setup_size);
- option_rom[nb_option_roms].name = "linuxboot.bin";
- option_rom[nb_option_roms].bootindex = 0;
+ if (fw_cfg_dma_enabled(fw_cfg)) {
+ option_rom[nb_option_roms].name = "linuxboot_dma.bin";
+ option_rom[nb_option_roms].bootindex = 0;
+ } else {
+ option_rom[nb_option_roms].name = "linuxboot.bin";
+ option_rom[nb_option_roms].bootindex = 0;
+ }
nb_option_roms++;
}
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index a1d650d..d0a5753 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -546,7 +546,7 @@ static bool is_version_1(void *opaque, int version_id)
return version_id == 1;
}
-static bool fw_cfg_dma_enabled(void *opaque)
+bool fw_cfg_dma_enabled(void *opaque)
{
FWCfgState *s = opaque;
diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
index 664eaf6..953e58d 100644
--- a/include/hw/nvram/fw_cfg.h
+++ b/include/hw/nvram/fw_cfg.h
@@ -219,6 +219,7 @@ FWCfgState *fw_cfg_init_mem_wide(hwaddr ctl_addr,
hwaddr dma_addr, AddressSpace *dma_as);
FWCfgState *fw_cfg_find(void);
+bool fw_cfg_dma_enabled(void *opaque);
#endif /* NO_QEMU_PROTOS */
diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index ce4852a..bdd0cc1 100644
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -13,15 +13,18 @@ CFLAGS := -Wall -Wstrict-prototypes -Werror
-fomit-frame-pointer -fno-builtin
CFLAGS += -I$(SRC_PATH)
CFLAGS += $(call cc-option, $(CFLAGS), -fno-stack-protector)
CFLAGS += $(CFLAGS_NOPIE)
+CFLAGS += -m32
QEMU_CFLAGS = $(CFLAGS)
-build-all: multiboot.bin linuxboot.bin kvmvapic.bin
+ASFLAGS += -32
+
+build-all: multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin
# suppress auto-removal of intermediate files
.SECONDARY:
%.img: %.o
- $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e _start -s -o $@
$<," Building $(TARGET_DIR)$@")
+ $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m elf_i386 -Ttext 0 -e
_start -s -o $@ $<," Building $(TARGET_DIR)$@")
%.raw: %.img
$(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@," Building
$(TARGET_DIR)$@")
diff --git a/pc-bios/optionrom/linuxboot_dma.c
b/pc-bios/optionrom/linuxboot_dma.c
new file mode 100644
index 0000000..c1181cd
--- /dev/null
+++ b/pc-bios/optionrom/linuxboot_dma.c
@@ -0,0 +1,288 @@
+/*
+ * Linux Boot Option ROM for fw_cfg DMA
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (c) 2015 Red Hat Inc.
+ * Authors: Marc Marí <mar...@redhat.com>
+ */
+
+asm(
+".text\n"
+".global _start\n"
+"_start:\n"
+" .short 0xaa55\n"
+" .byte (_end - _start) / 512\n"
+" lret\n"
+" .org 0x18\n"
+" .short 0\n"
+" .short _pnph\n"
+"_pnph:\n"
+" .ascii \"$PnP\"\n"
+" .byte 0x01\n"
+" .byte ( _pnph_len / 16 )\n"
+" .short 0x0000\n"
+" .byte 0x00\n"
+" .byte 0x00\n"
+" .long 0x00000000\n"
+" .short _manufacturer\n"
+" .short _product\n"
+" .long 0x00000000\n"
+" .short 0x0000\n"
+" .short 0x0000\n"
+" .short _bev\n"
+" .short 0x0000\n"
+" .short 0x0000\n"
+" .equ _pnph_len, . - _pnph\n"
+" .align 4, 0\n"
+"_bev:\n"
+".code16gcc\n"
+/* DS = CS */
+" movw %cs, %ax\n"
+" movw %ax, %ds\n"
+" movl %esp, %ebp\n"
+" cli\n"
+" cld\n"
+" jmp load_kernel\n"
+);
+
+#define NO_QEMU_PROTOS
+#include "../../include/hw/nvram/fw_cfg.h"
+
+#define BOOT_ROM_PRODUCT "Linux loader DMA"
+
+/* QEMU_CFG_DMA_CONTROL bits */
+#define BIOS_CFG_DMA_CTL_ERROR 0x01
+#define BIOS_CFG_DMA_CTL_READ 0x02
+#define BIOS_CFG_DMA_CTL_SKIP 0x04
+#define BIOS_CFG_DMA_CTL_SELECT 0x08
+
+#define BIOS_CFG_DMA_ADDR_HIGH 0x514
+#define BIOS_CFG_DMA_ADDR_LOW 0x518
+
+#define _stringify(S) #S
+#define stringify(S) _stringify(S)
+
+#define uint64_t unsigned long long
+#define uint32_t unsigned int
+#define uint16_t unsigned short
+
+#define barrier() asm("": : :"memory")
+
+typedef struct FWCfgDmaAccess {
+ uint32_t control;
+ uint32_t length;
+ uint64_t address;
+} __attribute__((packed)) FWCfgDmaAccess;
+
+static inline void outl(uint32_t value, uint16_t port) {
+ asm("outl %0, %w1" : : "a"(value), "Nd"(port));
+}
+
+static inline void set_es(void *addr) {
+ uint32_t seg = (uint32_t)addr >> 4;
+ asm("movl %0, %%es" : : "r"(seg));
+}
+
+static inline uint16_t readw_es(uint16_t offset) {
+ uint16_t val;
+ asm("addr32 movw %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
+ barrier();
+ return val;
+}
+
+static inline uint32_t readl_es(uint16_t offset) {
+ uint32_t val;
+ asm("addr32 movl %%es:(%1), %0" : "=r"(val) : "r"((uint32_t)offset));
+ barrier();
+ return val;
+}
+
+static inline void writel_es(uint16_t offset, uint32_t val) {
+ barrier();
+ asm("addr32 movl %0, %%es:(%1)" : : "r"(val), "r"((uint32_t)offset));
+}
+
+static inline uint32_t bswap32(uint32_t x)
+{
+ return (((x & 0x000000ffU) << 24) |
+ ((x & 0x0000ff00U) << 8) |
+ ((x & 0x00ff0000U) >> 8) |
+ ((x & 0xff000000U) >> 24));
+}
+
+static inline uint64_t bswap64(uint64_t x)
+{
+ return (((x & 0x00000000000000ffULL) << 56) |
+ ((x & 0x000000000000ff00ULL) << 40) |
+ ((x & 0x0000000000ff0000ULL) << 24) |
+ ((x & 0x00000000ff000000ULL) << 8) |
+ ((x & 0x000000ff00000000ULL) >> 8) |
+ ((x & 0x0000ff0000000000ULL) >> 24) |
+ ((x & 0x00ff000000000000ULL) >> 40) |
+ ((x & 0xff00000000000000ULL) >> 56));
+}
+
+static inline uint64_t cpu_to_be64(uint64_t x) {
+ return bswap64(x);
+}
+
+static inline uint32_t cpu_to_be32(uint32_t x) {
+ return bswap32(x);
+}
+
+static inline uint32_t be32_to_cpu(uint32_t x) {
+ return bswap32(x);
+}
+
+static void bios_cfg_read_entry(void *buf, uint16_t entry, uint32_t len)
+{
+ FWCfgDmaAccess access;
+ uint32_t control = (entry << 16) | BIOS_CFG_DMA_CTL_SELECT
+ | BIOS_CFG_DMA_CTL_READ;
+
+ access.address = cpu_to_be64((uint64_t)(uint32_t)buf);
+ access.length = cpu_to_be32(len);
+ access.control = cpu_to_be32(control);
+
+ barrier();
+
+ outl(cpu_to_be32((uint32_t)&access), BIOS_CFG_DMA_ADDR_LOW);
+
+ while(be32_to_cpu(access.control) & ~BIOS_CFG_DMA_CTL_ERROR) {
+ barrier();
+ }
+}
+
+static uint32_t get_e801_addr(void)
+{
+ uint32_t eax, ebx, ecx, edx;
+ uint32_t ret;
+
+ eax = 0xe801;
+ ebx = 0;
+ ecx = 0;
+ edx = 0;
+ asm("int $0x15\n"
+ : "+a"(eax)
+ : "b"(ebx), "c"(ecx), "d"(edx));
+
+ /* Output could be in AX/BX or CX/DX */
+ if ((uint16_t)ecx || (uint16_t)edx) {
+ if(!(uint16_t)edx) {
+ /* Add 1 MB and convert to bytes */
+ ret = (ecx + 1024) << 10;
+ } else {
+ /* Add 16 MB and convert to bytes */
+ ret = (edx + 256) << 16;
+ }
+ } else {
+ if(!(uint16_t)ebx) {
+ /* Add 1 MB and convert to bytes */
+ ret = (eax + 1024) << 10;
+ } else {
+ /* Add 16 MB and convert to bytes */
+ ret = (ebx + 256) << 16;
+ }
+ }
+
+ return ret;
+}
+
+void load_kernel(void)
+{
+ void *setup_addr;
+ void *initrd_addr;
+ void *kernel_addr;
+ void *cmdline_addr;
+ uint32_t setup_size;
+ uint32_t initrd_size;
+ uint32_t kernel_size;
+ uint32_t cmdline_size;
+ uint32_t initrd_end_page, max_allowed_page;
+ uint32_t segment_addr, stack_addr;
+
+ bios_cfg_read_entry(&setup_addr, FW_CFG_SETUP_ADDR, 4);
+ bios_cfg_read_entry(&setup_size, FW_CFG_SETUP_SIZE, 4);
+ bios_cfg_read_entry(setup_addr, FW_CFG_SETUP_DATA, setup_size);
+
+ set_es(setup_addr);
+
+ if (readw_es(0x206) < 0x203) {
+ /* Assume initrd_max 0x37ffffff */
+ writel_es(0x22c, 0x37ffffff);
+ }
+
+ bios_cfg_read_entry(&initrd_addr, FW_CFG_INITRD_ADDR, 4);
+ bios_cfg_read_entry(&initrd_size, FW_CFG_INITRD_SIZE, 4);
+
+ initrd_end_page = ((uint32_t)(initrd_addr + initrd_size) & -4096);
+ max_allowed_page = (readl_es(0x22c) & -4096);
+
+ if (initrd_end_page != 0 && max_allowed_page != 0 &&
+ initrd_end_page != max_allowed_page) {
+ /* Initrd at the end of memory. Compute better initrd address
+ * based on e801 data
+ */
+ initrd_addr = (void *)((get_e801_addr() - initrd_size) & -4096);
+ writel_es(0x218, (uint32_t)initrd_addr);
+
+ }
+
+ bios_cfg_read_entry(initrd_addr, FW_CFG_INITRD_DATA, initrd_size);
+
+ bios_cfg_read_entry(&kernel_addr, FW_CFG_KERNEL_ADDR, 4);
+ bios_cfg_read_entry(&kernel_size, FW_CFG_KERNEL_SIZE, 4);
+ bios_cfg_read_entry(kernel_addr, FW_CFG_KERNEL_DATA, kernel_size);
+
+ bios_cfg_read_entry(&cmdline_addr, FW_CFG_CMDLINE_ADDR, 4);
+ bios_cfg_read_entry(&cmdline_size, FW_CFG_CMDLINE_SIZE, 4);
+ bios_cfg_read_entry(cmdline_addr, FW_CFG_CMDLINE_DATA, cmdline_size);
+
+ /* Boot linux */
+ segment_addr = ((uint32_t)setup_addr >> 4);
+ stack_addr = (uint32_t)(cmdline_addr - setup_addr - 16);
+
+ /* As we are changing critical registers, we cannot leave freedom to the
+ * compiler.
+ */
+ asm("movw %%ax, %%ds\n"
+ "movw %%ax, %%es\n"
+ "movw %%ax, %%fs\n"
+ "movw %%ax, %%gs\n"
+ "movw %%ax, %%ss\n"
+ "movl %%ebx, %%esp\n"
+ "addw $0x20, %%ax\n"
+ "pushw %%ax\n" /* CS */
+ "pushw $0\n" /* IP */
+ /* Clear registers and jump to Linux */
+ "xor %%ebx, %%ebx\n"
+ "xor %%ecx, %%ecx\n"
+ "xor %%edx, %%edx\n"
+ "xor %%edi, %%edi\n"
+ "xor %%ebp, %%ebp\n"
+ "lretw\n"
+ : : "a"(segment_addr), "b"(stack_addr));
+}
+
+asm(
+"_manufacturer:\n"
+".asciz \"QEMU\"\n"
+"_product:\n"
+".asciz "stringify(BOOT_ROM_PRODUCT)"\n"
+".byte 0\n"
+".align 512, 0\n"
+"_end:\n"
+);
+
--
2.4.3
