s3c2410-io映射详解

/* s3c2410_map_io *

* register the standard cpu IO areas, and any passed in from the * machine specific initialisation. */

注册标准CPU的IO领域，并通过从任何特定的机器初始化。

struct cpu_table { unsigned long idcode;

unsigned long idmask; void void void int

(*map_io)(struct map_desc *mach_desc, int size); (*init_uarts)(struct s3c2410_uartcfg *cfg, int no); (*init_clocks)(int xtal); (*init)(void);

const char *name; };

s3c24xx_init_io（）-? iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));

smdk2410_map_io()---?s3c24xx_init_io（）

MACHINE_START(SMDK2410, \

* to SMDK2410 */ /* Maintainer: Jonas Dietsche */ .phys_io = S3C2410_PA_UART,

.io_pg_offst = (((u32)S3C24XX_VA_UART) >> 18) & 0xfffc, .boot_params = S3C2410_SDRAM_PA + 0x100, .map_io = smdk2410_map_io, .init_irq = s3c24xx_init_irq, .init_machine = smdk2410_init, .timer = &s3c24xx_timer,

MACHINE_END

void __init s3c2410_map_io(struct map_desc *mach_desc, int mach_size) {

/* register our io-tables */

iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc)); iotable_init(mach_desc, mach_size);

}

Cpu.c (linux-2.6.22.6\\arch\\arm\\plat-s3c24xx):.map_io = s3c2410_map_io,

E:\\华清远见资料\\zhihua_file1《ARM Linux静态映射分析.pdf》

研究这个就够了：

Cpu.c (linux-2.6.22.6\\arch\\arm\\plat-s3c24xx):

/* minimal IO mapping */

static struct map_desc s3c_iodesc[] __initdata = { };

linux/include/asm-arm/arch-s3c2410/map.h #define S3C2410_PA_GPIO (0x56000000)

#define S3C24XX_PA_GPIO S3C2410_PA_GPIO

struct map_desc { };

#define

IODESC_ENT(x)

{(unsignedlong)S3C24XX_VA_##x,

__phys_to_pfn(S3C24XX_PA_##x),

S3C24XX_SZ_##x,

MT_DEVICE }

IODESC_ENT(GPIO),

IODESC_ENT(GPIO), IODESC_ENT(IRQ), IODESC_ENT(MEMCTRL), IODESC_ENT(UART)

unsigned long virtual; unsigned long pfn; unsigned long length; unsigned int type;

#define __phys_to_pfn(paddr)

((paddr) >> PAGE_SHIFT)

IODESC_ENT(GPIO)-------? S3C24XX_VA_GPIO, __phys_to_pfn(S3C24XX_PA_GPIO),

从这里可以看出来了，把物理地址（寄存器相关的代映射到VA）

#define MACHINE_START(_type,_name)

\\

\\

static const struct machine_desc __mach_desc_##_type __used \\ __attribute__((__section__(\

.nr

= MACH_TYPE_##_type,

\\

.name = _name,

#define MACHINE_END

\\

\\

};

MACHINE_START(S3C2440, \

.phys_io = S3C2410_PA_UART,

.io_pg_offst = (((u32)S3C24XX_VA_UART) >> 18) & 0xfffc, .boot_params = S3C2410_SDRAM_PA + 0x100, .init_irq = s3c24xx_init_irq,

.map_io = smdk2440_map_io,

.init_machine = smdk2440_machine_init,

.timer = &s3c24xx_timer, MACHINE_END

#define MACHINE_START(S3C2440,SMDK2440)

static const struct machine_desc __mach_desc_S3C2440 \\ __used

\\

\\

__attribute__((__section__(\

\\

.nr = MACH_TYPE_S3C2440, \\ .name = SMDK2440,

#define MACHINE_END \\ //MACHINE_ENC = };这个符号呀，作为结构体的结束部分。 };

=====>>>>>>>>>>>>>>

--------------------------------------------------------------

static const struct machine_desc __mach_desc_S3C2440 __used

__attribute__((__section__(\

.init_irq = s3c24xx_init_irq,

.map_io = smdk2440_map_io,

.init_machine = smdk2440_machine_init, .timer = &s3c24xx_timer, .nr .name

= MACH_TYPE_S3C2440, = SMDK2440,

.phys_io = S3C2410_PA_UART,

.io_pg_offst = (((u32)S3C24XX_VA_UART) >> 18) & 0xfffc,

.boot_params = S3C2410_SDRAM_PA + 0x100,