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-rw-r--r--hw/mips/mips_malta.c36
1 files changed, 28 insertions, 8 deletions
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index ae0921c6aa..05c8771220 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -827,7 +827,8 @@ static int64_t load_kernel (void)
}
prom_set(prom_buf, prom_index++, "memsize");
- prom_set(prom_buf, prom_index++, "%i", loaderparams.ram_size);
+ prom_set(prom_buf, prom_index++, "%i",
+ MIN(loaderparams.ram_size, 256 << 20));
prom_set(prom_buf, prom_index++, "modetty0");
prom_set(prom_buf, prom_index++, "38400n8r");
prom_set(prom_buf, prom_index++, NULL);
@@ -884,7 +885,9 @@ void mips_malta_init(QEMUMachineInitArgs *args)
char *filename;
pflash_t *fl;
MemoryRegion *system_memory = get_system_memory();
- MemoryRegion *ram = g_new(MemoryRegion, 1);
+ MemoryRegion *ram_high = g_new(MemoryRegion, 1);
+ MemoryRegion *ram_low_preio = g_new(MemoryRegion, 1);
+ MemoryRegion *ram_low_postio;
MemoryRegion *bios, *bios_copy = g_new(MemoryRegion, 1);
target_long bios_size = FLASH_SIZE;
const size_t smbus_eeprom_size = 8 * 256;
@@ -951,15 +954,32 @@ void mips_malta_init(QEMUMachineInitArgs *args)
env = &cpu->env;
/* allocate RAM */
- if (ram_size > (256 << 20)) {
+ if (ram_size > (2048u << 20)) {
fprintf(stderr,
- "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
+ "qemu: Too much memory for this machine: %d MB, maximum 2048 MB\n",
((unsigned int)ram_size / (1 << 20)));
exit(1);
}
- memory_region_init_ram(ram, NULL, "mips_malta.ram", ram_size);
- vmstate_register_ram_global(ram);
- memory_region_add_subregion(system_memory, 0, ram);
+
+ /* register RAM at high address where it is undisturbed by IO */
+ memory_region_init_ram(ram_high, NULL, "mips_malta.ram", ram_size);
+ vmstate_register_ram_global(ram_high);
+ memory_region_add_subregion(system_memory, 0x80000000, ram_high);
+
+ /* alias for pre IO hole access */
+ memory_region_init_alias(ram_low_preio, NULL, "mips_malta_low_preio.ram",
+ ram_high, 0, MIN(ram_size, (256 << 20)));
+ memory_region_add_subregion(system_memory, 0, ram_low_preio);
+
+ /* alias for post IO hole access, if there is enough RAM */
+ if (ram_size > (512 << 20)) {
+ ram_low_postio = g_new(MemoryRegion, 1);
+ memory_region_init_alias(ram_low_postio, NULL,
+ "mips_malta_low_postio.ram",
+ ram_high, 512 << 20,
+ ram_size - (512 << 20));
+ memory_region_add_subregion(system_memory, 512 << 20, ram_low_postio);
+ }
/* generate SPD EEPROM data */
generate_eeprom_spd(&smbus_eeprom_buf[0 * 256], ram_size);
@@ -992,7 +1012,7 @@ void mips_malta_init(QEMUMachineInitArgs *args)
fl_idx++;
if (kernel_filename) {
/* Write a small bootloader to the flash location. */
- loaderparams.ram_size = ram_size;
+ loaderparams.ram_size = MIN(ram_size, 256 << 20);
loaderparams.kernel_filename = kernel_filename;
loaderparams.kernel_cmdline = kernel_cmdline;
loaderparams.initrd_filename = initrd_filename;