第二个函数
<span style="font-size:14px;">void arch_early_init(void)
{
/* turn off the cache */
arch_disable_cache(UCACHE);
/* set the vector base to our exception vectors so we dont need to double map at 0 */
#if ARM_CPU_CORTEX_A8
set_vector_base(MEMBASE);
#endif
#if ARM_WITH_MMU
arm_mmu_init();
#endif
/* turn the cache back on */
arch_enable_cache(UCACHE);
#if ARM_WITH_NEON
/* enable cp10 and cp11 */
uint32_t val;
__asm__ volatile("mrc p15, 0, %0, c1, c0, 2" : "=r" (val));
val |= (3<<22)|(3<<20);
__asm__ volatile("mcr p15, 0, %0, c1, c0, 2" :: "r" (val));
/* set enable bit in fpexc */
__asm__ volatile("mrc p10, 7, %0, c8, c0, 0" : "=r" (val));
val |= (1<<30);
__asm__ volatile("mcr p10, 7, %0, c8, c0, 0" :: "r" (val));
#endif
#if ARM_CPU_CORTEX_A8
/* enable the cycle count register */
uint32_t en;
__asm__ volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (en));
en &= ~(1<<3); /* cycle count every cycle */
en |= 1; /* enable all performance counters */
__asm__ volatile("mcr p15, 0, %0, c9, c12, 0" :: "r" (en));
/* enable cycle counter */
en = (1<<31);
__asm__ volatile("mcr p15, 0, %0, c9, c12, 1" :: "r" (en));
#endif
}</span>
用一些arm的汇编完成的动作,具体干啥后续再看
void platform_early_init(void)
{
board_init();
platform_clock_init();
qgic_init();
qtimer_init();
scm_init();
}
子函数一
void board_init()
{
platform_detect();
target_detect(&board); //这个是空函数
target_baseband_detect(&board); //根据之前的board的platform类型来选择board->baseband是那个地址
}
子函数11通过获取指定地址的信息来判断这块板子是什么类型的,并赋值给board这个结构体
static void platform_detect()
{
struct smem_board_info_v6 board_info_v6;
struct smem_board_info_v7 board_info_v7;
struct smem_board_info_v8 board_info_v8;
unsigned int board_info_len = 0;
unsigned ret = 0;
unsigned format = 0;
unsigned pmic_type = 0;
uint8_t i;
uint16_t format_major = 0;
uint16_t format_minor = 0;
ret = smem_read_alloc_entry_offset(SMEM_BOARD_INFO_LOCATION,
&format, sizeof(format), 0);
if (ret)
return;
/* Extract the major & minor version info,
* Upper two bytes: major info
* Lower two byets: minor info
*/
format_major = (format & 0xffff0000) >> 16;
format_minor = format & 0x0000ffff;
if (format_major == 0x0)
{
if (format_minor == 6)
{
board_info_len = sizeof(board_info_v6);
ret = smem_read_alloc_entry(SMEM_BOARD_INFO_LOCATION,
&board_info_v6,
board_info_len);
if (ret)
return;
board.platform = board_info_v6.board_info_v3.msm_id;
board.platform_version = board_info_v6.board_info_v3.msm_version;
board.platform_hw = board_info_v6.board_info_v3.hw_platform;
board.platform_subtype = board_info_v6.platform_subtype;
}
else if (format_minor == 7)
{
board_info_len = sizeof(board_info_v7);
ret = smem_read_alloc_entry(SMEM_BOARD_INFO_LOCATION,
&board_info_v7,
board_info_len);
if (ret)
return;
board.platform = board_info_v7.board_info_v3.msm_id;
board.platform_version = board_info_v7.board_info_v3.msm_version;
board.platform_hw = board_info_v7.board_info_v3.hw_platform;
board.platform_subtype = board_info_v7.platform_subtype;
board.pmic_info[0].pmic_type = board_info_v7.pmic_type;
board.pmic_info[0].pmic_version = board_info_v7.pmic_version;
}
else if (format_minor >= 8)
{
dprintf(INFO, "Minor socinfo format detected: %u.%u\n", format_major, format_minor);
board_info_len = sizeof(board_info_v8);
ret = smem_read_alloc_entry(SMEM_BOARD_INFO_LOCATION,
&board_info_v8,
board_info_len);
if (ret)
return;
board.platform = board_info_v8.board_info_v3.msm_id;
board.platform_version = board_info_v8.board_info_v3.msm_version;
board.platform_hw = board_info_v8.board_info_v3.hw_platform;
board.platform_subtype = board_info_v8.platform_subtype;
/*
* fill in board.target with variant_id information
* bit no |31 24 | 23 16 | 15 8 |7 0|
* board.target = |subtype| plat_hw_ver major | plat_hw_ver minor |hw_platform|
*
*/
board.target = (((board_info_v8.platform_subtype & 0xff) << 24) |
(((board_info_v8.platform_version >> 16) & 0xff) << 16) |
((board_info_v8.platform_version & 0xff) << 8) |
(board_info_v8.board_info_v3.hw_platform & 0xff));
for (i = 0; i < SMEM_V8_SMEM_MAX_PMIC_DEVICES; i++) {
board.pmic_info[i].pmic_type = board_info_v8.pmic_info[i].pmic_type;
board.pmic_info[i].pmic_version = board_info_v8.pmic_info[i].pmic_version;
/*
* fill in pimc_board_info with pmic type and pmic version information
* bit no |31 24 | 23 16 | 15 8 |7 0|
* pimc_board_info = |Unused | Major version | Minor version|PMIC_MODEL|
*
*/
pmic_type = board_info_v8.pmic_info[i].pmic_type == PMIC_IS_INVALID? 0 : board_info_v8.pmic_info[i].pmic_type;
board.pmic_info[i].pmic_target = (((board_info_v8.pmic_info[i].pmic_version >> 16) & 0xff) << 16) |
((board_info_v8.pmic_info[i].pmic_version & 0xff) << 8) | (pmic_type & 0xff);
}
if (format_minor == 0x9)
board.foundry_id = board_info_v8.foundry_id;
}
/* HLOS subtype
* bit no |31 20 | 19 16|15 13 |12 11 | 10 8 | 7 0|
* board.platform_hlos_subtype = |reserved | Boot device |Reserved | Panel | DDR detection | subtype|
* | bits | | bits | Detection |
*/
board.platform_hlos_subtype = (board_get_ddr_subtype() << 8) | (platform_get_boot_dev() << 16) | (platform_detect_panel() << 11);
}
else
{
dprintf(CRITICAL, "Unsupported board info format %u.%u\n", format_major, format_minor);
ASSERT(0);
}
}
主要的特点是对地址的强制转型
比如
smem = (struct smem *)smem_addr;
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