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x86: qemu: move x86 specific operations out of qfw core

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The original implementation of qfw includes several x86 specific
operations, like directly calling outb/inb and using some inline
assembly code which prevents it being ported to other architectures.

This patch adds callback functions and moves those to arch/x86/

Signed-off-by: Miao Yan <yanmiaobest@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Miao Yan 2016-05-22 19:37:15 -07:00 committed by Bin Meng
parent fcf5c04193
commit 2e82e745a4
3 changed files with 60 additions and 24 deletions
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39
arch/x86/cpu/qemu/qemu.c
View file

@ -15,6 +15,43 @@
static bool i440fx;
#ifdef CONFIG_QFW
#define FW_CONTROL_PORT 0x510
#define FW_DATA_PORT 0x511
#define FW_DMA_PORT_LOW 0x514
#define FW_DMA_PORT_HIGH 0x518
static void qemu_x86_fwcfg_read_entry_pio(uint16_t entry,
uint32_t size, void *address)
{
uint32_t i = 0;
uint8_t *data = address;
/*
* writting FW_CFG_INVALID will cause read operation to resume at
* last offset, otherwise read will start at offset 0
*/
if (entry != FW_CFG_INVALID)
outw(entry, FW_CONTROL_PORT);
while (size--)
data[i++] = inb(FW_DATA_PORT);
}
static void qemu_x86_fwcfg_read_entry_dma(struct fw_cfg_dma_access *dma)
{
outl(cpu_to_be32((uint32_t)dma), FW_DMA_PORT_HIGH);
while (be32_to_cpu(dma->control) & ~FW_CFG_DMA_ERROR)
__asm__ __volatile__ ("pause");
}
static struct fw_cfg_arch_ops fwcfg_x86_ops = {
.arch_read_pio = qemu_x86_fwcfg_read_entry_pio,
.arch_read_dma = qemu_x86_fwcfg_read_entry_dma
};
#endif
static void enable_pm_piix(void)
{
u8 en;
@ -89,7 +126,7 @@ static void qemu_chipset_init(void)
}
#ifdef CONFIG_QFW
qemu_fwcfg_init();
qemu_fwcfg_init(&fwcfg_x86_ops);
#endif
}

30
drivers/misc/qemu_fw_cfg.c
View file

@ -14,6 +14,7 @@
static bool fwcfg_present;
static bool fwcfg_dma_present;
static struct fw_cfg_arch_ops *fwcfg_arch_ops;
static LIST_HEAD(fw_list);
@ -21,17 +22,10 @@ static LIST_HEAD(fw_list);
static void qemu_fwcfg_read_entry_pio(uint16_t entry,
uint32_t size, void *address)
{
uint32_t i = 0;
uint8_t *data = address;
debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n",
entry, size, address);
/*
* writting FW_CFG_INVALID will cause read operation to resume at
* last offset, otherwise read will start at offset 0
*/
if (entry != FW_CFG_INVALID)
outw(entry, FW_CONTROL_PORT);
while (size--)
data[i++] = inb(FW_DATA_PORT);
return fwcfg_arch_ops->arch_read_pio(entry, size, address);
}
/* Read configuration item using fw_cfg DMA interface */
@ -53,13 +47,10 @@ static void qemu_fwcfg_read_entry_dma(uint16_t entry,
barrier();
debug("qemu_fwcfg_dma_read_entry: addr %p, length %u control 0x%x\n",
address, size, be32_to_cpu(dma.control));
debug("qemu_fwcfg_read_entry_dma: entry 0x%x, size %u address %p, control 0x%x\n",
entry, size, address, be32_to_cpu(dma.control));
outl(cpu_to_be32((uint32_t)&dma), FW_DMA_PORT_HIGH);
while (be32_to_cpu(dma.control) & ~FW_CFG_DMA_ERROR)
__asm__ __volatile__ ("pause");
fwcfg_arch_ops->arch_read_dma(&dma);
}
bool qemu_fwcfg_present(void)
@ -164,13 +155,18 @@ bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter)
return iter->entry == &fw_list;
}
void qemu_fwcfg_init(void)
void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops)
{
uint32_t qemu;
uint32_t dma_enabled;
fwcfg_present = false;
fwcfg_dma_present = false;
fwcfg_arch_ops = NULL;
if (!ops || !ops->arch_read_pio || !ops->arch_read_dma)
return;
fwcfg_arch_ops = ops;
qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
if (be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE)

15
include/qemu_fw_cfg.h
View file

@ -7,11 +7,6 @@
#ifndef __FW_CFG__
#define __FW_CFG__
#define FW_CONTROL_PORT 0x510
#define FW_DATA_PORT 0x511
#define FW_DMA_PORT_LOW 0x514
#define FW_DMA_PORT_HIGH 0x518
#include <linux/list.h>
enum qemu_fwcfg_items {
@ -97,6 +92,12 @@ struct fw_cfg_dma_access {
__be64 address;
};
struct fw_cfg_arch_ops {
void (*arch_read_pio)(uint16_t selector, uint32_t size,
void *address);
void (*arch_read_dma)(struct fw_cfg_dma_access *dma);
};
struct bios_linker_entry {
__le32 command;
union {
@ -148,8 +149,10 @@ struct bios_linker_entry {
/**
* Initialize QEMU fw_cfg interface
*
* @ops: arch specific read operations
*/
void qemu_fwcfg_init(void);
void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops);
void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address);
int qemu_fwcfg_read_firmware_list(void);