On 12/19/20 8:23 AM, Jiaxun Yang wrote: > highmem started from 0x20000000.
"started from" -> "starts at"? > Now we can have up to 2G RAM. > > Signed-off-by: Jiaxun Yang <jiaxun.y...@flygoat.com> > --- > v2: Handle SPD for dual DIMM correctly. > --- > hw/mips/fuloong2e.c | 61 ++++++++++++++++++++++++++++++++++++--------- > 1 file changed, 49 insertions(+), 12 deletions(-) > > diff --git a/hw/mips/fuloong2e.c b/hw/mips/fuloong2e.c > index 2744b211fd..8a4bebe066 100644 > --- a/hw/mips/fuloong2e.c > +++ b/hw/mips/fuloong2e.c > @@ -56,6 +56,7 @@ > /* Fuloong 2e has a 512k flash: Winbond W39L040AP70Z */ > #define BIOS_SIZE (512 * KiB) > #define MAX_IDE_BUS 2 > +#define HIGHMEM_START 0x20000000 > > /* > * PMON is not part of qemu and released with BSD license, anyone > @@ -71,7 +72,8 @@ > #define FULOONG2E_RTL8139_SLOT 7 > > static struct _loaderparams { > - int ram_size; > + int ram_low_size; > + int ram_high_size; > const char *kernel_filename; > const char *kernel_cmdline; > const char *initrd_filename; > @@ -128,14 +130,14 @@ static uint64_t load_kernel(MIPSCPU *cpu) > initrd_size = get_image_size(loaderparams.initrd_filename); > if (initrd_size > 0) { > initrd_offset = ROUND_UP(kernel_high, INITRD_PAGE_SIZE); > - if (initrd_offset + initrd_size > loaderparams.ram_size) { > + if (initrd_offset + initrd_size > loaderparams.ram_low_size) { > error_report("memory too small for initial ram disk '%s'", > loaderparams.initrd_filename); > exit(1); > } > initrd_size = load_image_targphys(loaderparams.initrd_filename, > initrd_offset, > - loaderparams.ram_size - > initrd_offset); > + loaderparams.ram_low_size - > initrd_offset); > } > if (initrd_size == (target_ulong) -1) { > error_report("could not load initial ram disk '%s'", > @@ -160,7 +162,11 @@ static uint64_t load_kernel(MIPSCPU *cpu) > > /* Setup minimum environment variables */ > prom_set(prom_buf, index++, "cpuclock=%u", clock_get_hz(cpu->clock)); > - prom_set(prom_buf, index++, "memsize=%"PRIi64, loaderparams.ram_size / > MiB); > + prom_set(prom_buf, index++, "memsize=%"PRIi64, loaderparams.ram_low_size > / MiB); > + if (loaderparams.ram_high_size > 0) { > + prom_set(prom_buf, index++, "highmemsize=%"PRIi64, > + loaderparams.ram_high_size / MiB); > + } > prom_set(prom_buf, index++, NULL); > > rom_add_blob_fixed("prom", prom_buf, prom_size, ENVP_PADDR); > @@ -186,7 +192,7 @@ static void write_bootloader(CPUMIPSState *env, uint8_t > *base, > p = (uint32_t *)(base + 0x040); > > bl_gen_jump_kernel(&p, ENVP_VADDR - 64, 2, ENVP_VADDR, > - ENVP_VADDR + 8, loaderparams.ram_size, > + ENVP_VADDR + 8, loaderparams.ram_low_size, > kernel_addr); > } > > @@ -258,8 +264,11 @@ static void mips_fuloong2e_init(MachineState *machine) > const char *kernel_filename = machine->kernel_filename; > const char *kernel_cmdline = machine->kernel_cmdline; > const char *initrd_filename = machine->initrd_filename; > + ram_addr_t ram_low_size, ram_high_size = 0; > char *filename; > MemoryRegion *address_space_mem = get_system_memory(); > + MemoryRegion *ram_low_alias = g_new(MemoryRegion, 1); > + MemoryRegion *ram_high_alias; > MemoryRegion *bios = g_new(MemoryRegion, 1); > long bios_size; > uint8_t *spd_data; > @@ -282,12 +291,31 @@ static void mips_fuloong2e_init(MachineState *machine) > > qemu_register_reset(main_cpu_reset, cpu); > > - /* TODO: support more than 256M RAM as highmem */ > - if (machine->ram_size != 256 * MiB) { > - error_report("Invalid RAM size, should be 256MB"); > + if (machine->ram_size > 2 * GiB) { > + error_report("Too much memory for this machine: %" PRId64 "MB," > + " maximum 2048MB", machine->ram_size / MiB); > exit(EXIT_FAILURE); > } > - memory_region_add_subregion(address_space_mem, 0, machine->ram); > + > + ram_low_size = MIN(machine->ram_size, 256 * MiB); > + > + memory_region_init_alias(ram_low_alias, NULL, > + "ram_low_alias", > + machine->ram, 0, > + ram_low_size); > + memory_region_add_subregion(address_space_mem, 0, > + ram_low_alias); > + > + if (machine->ram_size > 256 * MiB) { > + ram_high_alias = g_new(MemoryRegion, 1); > + ram_high_size = machine->ram_size - ram_low_size; > + memory_region_init_alias(ram_high_alias, NULL, > + "ram_high_alias", > + machine->ram, ram_low_size, > + ram_high_size); > + memory_region_add_subregion(address_space_mem, HIGHMEM_START, > + ram_high_alias); Cool, I've been using the same patch for one year. It works fine with a Linux kernel which doesn't change the northbridge mapping. As there is no plan for using another bootloader than PMON with this machine, that is fine. > + } > > /* Boot ROM */ > memory_region_init_rom(bios, NULL, "fuloong2e.bios", BIOS_SIZE, > @@ -300,7 +328,8 @@ static void mips_fuloong2e_init(MachineState *machine) > */ > > if (kernel_filename) { > - loaderparams.ram_size = machine->ram_size; > + loaderparams.ram_low_size = ram_low_size; > + loaderparams.ram_high_size = ram_high_size; > loaderparams.kernel_filename = kernel_filename; > loaderparams.kernel_cmdline = kernel_cmdline; > loaderparams.initrd_filename = initrd_filename; > @@ -345,8 +374,16 @@ static void mips_fuloong2e_init(MachineState *machine) > } > > /* Populate SPD eeprom data */ > - spd_data = spd_data_generate(DDR, machine->ram_size); > - smbus_eeprom_init_one(smbus, 0x50, spd_data); > + if (machine->ram_size <= 1 * GiB) { > + /* It supports maxium of 1 GiB per DIMM */ Typo "maximum". Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org> > + spd_data = spd_data_generate(DDR, machine->ram_size); > + smbus_eeprom_init_one(smbus, 0x50, spd_data); > + } else { > + /* Split to dual DIMM for more than 1 GiB */ > + spd_data = spd_data_generate(DDR, machine->ram_size / 2); > + smbus_eeprom_init_one(smbus, 0x50, spd_data); > + smbus_eeprom_init_one(smbus, 0x51, spd_data); > + } > > mc146818_rtc_init(isa_bus, 2000, NULL); > >