@@ -58,21 +58,13 @@ asm(
" jmp load_kernel\n"
);
-#define BIOS_CFG_DMA_ADDR_HIGH 0x514
-#define BIOS_CFG_DMA_ADDR_LOW 0x518
-
-#define uint64_t unsigned long long
-#define uint32_t unsigned int
-#define uint16_t unsigned short
-
-#include "../../include/standard-headers/linux/qemu_fw_cfg.h"
-
-#define barrier() asm("" : : : "memory")
-
-static inline void outl(uint32_t value, uint16_t port)
-{
- asm("outl %0, %w1" : : "a"(value), "Nd"(port));
-}
+/*
+ * The includes of C headers must be after the asm block to avoid compiler
+ * errors.
+ */
+#include <stdint.h>
+#include "optrom.h"
+#include "optrom_fw_cfg.h"
static inline void set_es(void *addr)
{
@@ -80,12 +72,6 @@ static inline void set_es(void *addr)
asm("movl %0, %%es" : : "r"(seg));
}
-#ifdef __clang__
-#define ADDR32
-#else
-#define ADDR32 "addr32 "
-#endif
-
static inline uint16_t readw_es(uint16_t offset)
{
uint16_t val;
@@ -108,56 +94,6 @@ static inline void writel_es(uint16_t offset, uint32_t val)
asm(ADDR32 "movl %0, %%es:(%1)" : : "r"(val), "r"((uint32_t)offset));
}
-static inline uint32_t bswap32(uint32_t x)
-{
- asm("bswapl %0" : "=r" (x) : "0" (x));
- return x;
-}
-
-static inline uint64_t bswap64(uint64_t x)
-{
- asm("bswapl %%eax; bswapl %%edx; xchg %%eax, %%edx" : "=A" (x) : "0" (x));
- return x;
-}
-
-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);
-}
-
-/* clang is happy to inline this function, and bloats the
- * ROM.
- */
-static __attribute__((__noinline__))
-void bios_cfg_read_entry(void *buf, uint16_t entry, uint32_t len)
-{
- struct fw_cfg_dma_access access;
- uint32_t control = (entry << 16) | FW_CFG_DMA_CTL_SELECT
- | FW_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) & ~FW_CFG_DMA_CTL_ERROR) {
- barrier();
- }
-}
-
/* Return top of memory using BIOS function E801. */
static uint32_t get_e801_addr(void)
{
@@ -211,9 +147,9 @@ void load_kernel(void)
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);
+ bios_cfg_read_entry_dma(&setup_addr, FW_CFG_SETUP_ADDR, 4);
+ bios_cfg_read_entry_dma(&setup_size, FW_CFG_SETUP_SIZE, 4);
+ bios_cfg_read_entry_dma(setup_addr, FW_CFG_SETUP_DATA, setup_size);
set_es(setup_addr);
@@ -223,8 +159,8 @@ void load_kernel(void)
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);
+ bios_cfg_read_entry_dma(&initrd_addr, FW_CFG_INITRD_ADDR, 4);
+ bios_cfg_read_entry_dma(&initrd_size, FW_CFG_INITRD_SIZE, 4);
initrd_end_page = ((uint32_t)(initrd_addr + initrd_size) & -4096);
max_allowed_page = (readl_es(0x22c) & -4096);
@@ -239,15 +175,15 @@ void load_kernel(void)
}
- bios_cfg_read_entry(initrd_addr, FW_CFG_INITRD_DATA, initrd_size);
+ bios_cfg_read_entry_dma(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_dma(&kernel_addr, FW_CFG_KERNEL_ADDR, 4);
+ bios_cfg_read_entry_dma(&kernel_size, FW_CFG_KERNEL_SIZE, 4);
+ bios_cfg_read_entry_dma(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);
+ bios_cfg_read_entry_dma(&cmdline_addr, FW_CFG_CMDLINE_ADDR, 4);
+ bios_cfg_read_entry_dma(&cmdline_size, FW_CFG_CMDLINE_SIZE, 4);
+ bios_cfg_read_entry_dma(cmdline_addr, FW_CFG_CMDLINE_DATA, cmdline_size);
/* Boot linux */
segment_addr = ((uint32_t)setup_addr >> 4);
new file mode 100644
@@ -0,0 +1,110 @@
+/*
+ * Common Option ROM Functions for C code
+ *
+ * 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) 2015-2019 Red Hat Inc.
+ * Authors:
+ * Marc Marí <marc.mari.barcelo@gmail.com>
+ * Richard W.M. Jones <rjones@redhat.com>
+ * Stefano Garzarella <sgarzare@redhat.com>
+ */
+
+#ifndef OPTROM_H
+#define OPTROM_H
+
+#include <stdint.h>
+#include "../../include/standard-headers/linux/qemu_fw_cfg.h"
+
+#define barrier() asm("" : : : "memory")
+
+#ifdef __clang__
+#define ADDR32
+#else
+#define ADDR32 "addr32 "
+#endif
+
+static inline void outb(uint8_t value, uint16_t port)
+{
+ asm volatile("outb %0, %w1" : : "a"(value), "Nd"(port));
+}
+
+static inline void outw(uint16_t value, uint16_t port)
+{
+ asm volatile("outw %0, %w1" : : "a"(value), "Nd"(port));
+}
+
+static inline void outl(uint32_t value, uint16_t port)
+{
+ asm volatile("outl %0, %w1" : : "a"(value), "Nd"(port));
+}
+
+static inline uint8_t inb(uint16_t port)
+{
+ uint8_t value;
+
+ asm volatile("outl %w1, %0" : : "a"(value), "Nd"(port));
+ return value;
+}
+
+static inline uint16_t inw(uint16_t port)
+{
+ uint16_t value;
+
+ asm volatile("outl %w1, %0" : : "a"(value), "Nd"(port));
+ return value;
+}
+
+static inline uint32_t inl(uint16_t port)
+{
+ uint32_t value;
+
+ asm volatile("outl %w1, %0" : : "a"(value), "Nd"(port));
+ return value;
+}
+
+static inline void insb(uint16_t port, uint8_t *buf, uint32_t len)
+{
+ asm volatile("rep insb (%%dx), %%es:(%%edi)"
+ : "+c"(len), "+D"(buf) : "d"(port) : "memory");
+}
+
+static inline uint32_t bswap32(uint32_t x)
+{
+ asm("bswapl %0" : "=r" (x) : "0" (x));
+ return x;
+}
+
+static inline uint64_t bswap64(uint64_t x)
+{
+ asm("bswapl %%eax; bswapl %%edx; xchg %%eax, %%edx" : "=A" (x) : "0" (x));
+ return x;
+}
+
+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);
+}
+
+#endif /* OPTROM_H */
new file mode 100644
@@ -0,0 +1,92 @@
+/*
+ * Common Option ROM Functions for fw_cfg
+ *
+ * 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) 2015-2019 Red Hat Inc.
+ * Authors:
+ * Marc Marí <marc.mari.barcelo@gmail.com>
+ * Richard W.M. Jones <rjones@redhat.com>
+ * Stefano Garzarella <sgarzare@redhat.com>
+ */
+
+#ifndef OPTROM_FW_CFG_H
+#define OPTROM_FW_CFG_H
+
+#include "../../include/standard-headers/linux/qemu_fw_cfg.h"
+
+#define BIOS_CFG_IOPORT_CFG 0x510
+#define BIOS_CFG_IOPORT_DATA 0x511
+#define BIOS_CFG_DMA_ADDR_HIGH 0x514
+#define BIOS_CFG_DMA_ADDR_LOW 0x518
+
+static __attribute__((unused))
+void bios_cfg_select(uint16_t key)
+{
+ outw(key, BIOS_CFG_IOPORT_CFG);
+}
+
+static __attribute__((unused))
+void bios_cfg_read_entry_io(void *buf, uint16_t entry, uint32_t len)
+{
+ bios_cfg_select(entry);
+ insb(BIOS_CFG_IOPORT_DATA, buf, len);
+}
+
+/*
+ * clang is happy to inline this function, and bloats the
+ * ROM.
+ */
+static __attribute__((__noinline__)) __attribute__((unused))
+void bios_cfg_read_entry_dma(void *buf, uint16_t entry, uint32_t len)
+{
+ struct fw_cfg_dma_access access;
+ uint32_t control = (entry << 16) | FW_CFG_DMA_CTL_SELECT
+ | FW_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) & ~FW_CFG_DMA_CTL_ERROR) {
+ barrier();
+ }
+}
+
+static __attribute__((unused))
+void bios_cfg_read_entry(void *buf, uint16_t entry, uint32_t len,
+ uint32_t version)
+{
+ if (version & FW_CFG_VERSION_DMA) {
+ bios_cfg_read_entry_dma(buf, entry, len);
+ } else {
+ bios_cfg_read_entry_io(buf, entry, len);
+ }
+}
+
+static __attribute__((unused))
+uint32_t bios_cfg_version(void)
+{
+ uint32_t version;
+
+ bios_cfg_read_entry_io(&version, FW_CFG_ID, sizeof(version));
+
+ return version;
+}
+
+#endif /* OPTROM_FW_CFG_H */