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linuxboot_dma: move common functions in a new header

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In order to allow other option roms to use these common
useful functions and definitions, this patch put them
in two new C header files called optrom.h and
optrom_fw_cfg.h. We also add useful out*() in*()
functions for different size, and new fw_cfg functions
to use when DMA feature is not available.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
This commit is contained in:
Stefano Garzarella 2019-01-18 13:01:40 +01:00 committed by Paolo Bonzini
parent 526d798435
commit 6dfa01437b
3 changed files with 221 additions and 83 deletions
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102
pc-bios/optionrom/linuxboot_dma.c
View file

@ -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);

110
pc-bios/optionrom/optrom.h Normal file
View file

@ -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("inb %w1, %0" : "=a"(value) : "Nd"(port));
return value;
}
static inline uint16_t inw(uint16_t port)
{
uint16_t value;
asm volatile("inw %w1, %0" : "=a"(value) : "Nd"(port));
return value;
}
static inline uint32_t inl(uint16_t port)
{
uint32_t value;
asm volatile("inl %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 */

92
pc-bios/optionrom/optrom_fw_cfg.h Normal file
View file

@ -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 */