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x86: qemu: Support getting high memory size

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At present only size of memory that is below 4GiB is retrieved from
QEMU. Add a function that gets size of memory that is above 4GiB.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Aiden Park <aiden.park@intel.com>
This commit is contained in:
Bin Meng 2019-08-29 02:53:05 -07:00
parent f4c0030074
commit ea67d549b8
2 changed files with 36 additions and 2 deletions
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27
arch/x86/cpu/qemu/dram.c
View file

@ -22,9 +22,24 @@ u32 qemu_get_low_memory_size(void)
return ram * 1024;
}
u64 qemu_get_high_memory_size(void)
{
u64 ram;
outb(HIGH_HIGHRAM_ADDR, CMOS_ADDR_PORT);
ram = ((u64)inb(CMOS_DATA_PORT)) << 22;
outb(MID_HIGHRAM_ADDR, CMOS_ADDR_PORT);
ram |= ((u64)inb(CMOS_DATA_PORT)) << 14;
outb(LOW_HIGHRAM_ADDR, CMOS_ADDR_PORT);
ram |= ((u64)inb(CMOS_DATA_PORT)) << 6;
return ram * 1024;
}
int dram_init(void)
{
gd->ram_size = qemu_get_low_memory_size();
gd->ram_size += qemu_get_high_memory_size();
post_code(POST_DRAM);
return 0;
@ -32,8 +47,16 @@ int dram_init(void)
int dram_init_banksize(void)
{
u64 high_mem_size;
gd->bd->bi_dram[0].start = 0;
gd->bd->bi_dram[0].size = gd->ram_size;
gd->bd->bi_dram[0].size = qemu_get_low_memory_size();
high_mem_size = qemu_get_high_memory_size();
if (high_mem_size) {
gd->bd->bi_dram[1].start = SZ_4G;
gd->bd->bi_dram[1].size = high_mem_size;
}
return 0;
}
@ -48,5 +71,5 @@ int dram_init_banksize(void)
*/
ulong board_get_usable_ram_top(ulong total_size)
{
return gd->ram_size;
return qemu_get_low_memory_size();
}

11
arch/x86/include/asm/arch-qemu/qemu.h
View file

@ -32,6 +32,10 @@
#define LOW_RAM_ADDR 0x34
#define HIGH_RAM_ADDR 0x35
#define LOW_HIGHRAM_ADDR 0x5b
#define MID_HIGHRAM_ADDR 0x5c
#define HIGH_HIGHRAM_ADDR 0x5d
/* PM registers */
#define PMBA 0x40
#define PMREGMISC 0x80
@ -44,4 +48,11 @@
*/
u32 qemu_get_low_memory_size(void);
/**
* qemu_get_high_memory_size() - Get high memory size
*
* @return: size of memory above 4GiB
*/
u64 qemu_get_high_memory_size(void);
#endif /* _ARCH_QEMU_H_ */