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aspeed: add a max_ram_size property to the memory controller

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This will be used to construct a memory region beyond the RAM region
to let firmwares scan the address space with load/store to guess how
much RAM the SoC has.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180807075757.7242-7-joel@jms.id.au
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Cédric Le Goater 2018-08-16 14:05:29 +01:00 • committed by Peter Maydell
parent a7b4569a4d
commit ebe31c0a8e
4 changed files with 37 additions and 0 deletions
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31
hw/arm/aspeed.c
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@ -31,6 +31,7 @@ static struct arm_boot_info aspeed_board_binfo = {
typedef struct AspeedBoardState {
AspeedSoCState soc;
MemoryRegion ram;
MemoryRegion max_ram;
} AspeedBoardState;
typedef struct AspeedBoardConfig {
@ -127,6 +128,27 @@ static const AspeedBoardConfig aspeed_boards[] = {
},
};
/*
* The max ram region is for firmwares that scan the address space
* with load/store to guess how much RAM the SoC has.
*/
static uint64_t max_ram_read(void *opaque, hwaddr offset, unsigned size)
{
return 0;
}
static void max_ram_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
/* Discard writes */
}
static const MemoryRegionOps max_ram_ops = {
.read = max_ram_read,
.write = max_ram_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
#define FIRMWARE_ADDR 0x0
static void write_boot_rom(DriveInfo *dinfo, hwaddr addr, size_t rom_size,
@ -187,6 +209,7 @@ static void aspeed_board_init(MachineState *machine,
AspeedBoardState *bmc;
AspeedSoCClass *sc;
DriveInfo *drive0 = drive_get(IF_MTD, 0, 0);
ram_addr_t max_ram_size;
bmc = g_new0(AspeedBoardState, 1);
object_initialize(&bmc->soc, (sizeof(bmc->soc)), cfg->soc_name);
@ -226,6 +249,14 @@ static void aspeed_board_init(MachineState *machine,
object_property_add_const_link(OBJECT(&bmc->soc), "ram", OBJECT(&bmc->ram),
&error_abort);
max_ram_size = object_property_get_uint(OBJECT(&bmc->soc), "max-ram-size",
&error_abort);
memory_region_init_io(&bmc->max_ram, NULL, &max_ram_ops, NULL,
"max_ram", max_ram_size - ram_size);
memory_region_add_subregion(get_system_memory(),
sc->info->sdram_base + ram_size,
&bmc->max_ram);
aspeed_board_init_flashes(&bmc->soc.fmc, cfg->fmc_model, &error_abort);
aspeed_board_init_flashes(&bmc->soc.spi[0], cfg->spi_model, &error_abort);