From e25acd619135c752672de323f22aba8c1d00584e Mon Sep 17 00:00:00 2001 From: BALATON Zoltan Date: Tue, 28 Nov 2023 02:32:53 +0100 Subject: [PATCH] ppc/amigaone: Allow running AmigaOS without firmware image The machine uses a modified U-Boot under GPL license but the sources of it are lost with only a binary available so it cannot be included in QEMU. Allow running without the firmware image which can be used when calling a boot loader directly and thus simplifying booting guests. We need a small routine that AmigaOS calls from ROM which is added in this case to allow booting AmigaOS without external firmware image. Fixes: d9656f860a38 ("hw/ppc: Add emulation of AmigaOne XE board") Signed-off-by: BALATON Zoltan Signed-off-by: Nicholas Piggin --- hw/ppc/amigaone.c | 35 +++++++++++++++++++++++------------ 1 file changed, 23 insertions(+), 12 deletions(-) diff --git a/hw/ppc/amigaone.c b/hw/ppc/amigaone.c index 992a55e632..ddfa09457a 100644 --- a/hw/ppc/amigaone.c +++ b/hw/ppc/amigaone.c @@ -36,10 +36,19 @@ * -device VGA,romfile=VGABIOS-lgpl-latest.bin * from http://www.nongnu.org/vgabios/ instead. */ -#define PROM_FILENAME "u-boot-amigaone.bin" #define PROM_ADDR 0xfff00000 #define PROM_SIZE (512 * KiB) +/* AmigaOS calls this routine from ROM, use this if no firmware loaded */ +static const char dummy_fw[] = { + 0x38, 0x00, 0x00, 0x08, /* li r0,8 */ + 0x7c, 0x09, 0x03, 0xa6, /* mtctr r0 */ + 0x54, 0x63, 0xf8, 0x7e, /* srwi r3,r3,1 */ + 0x42, 0x00, 0xff, 0xfc, /* bdnz 0x8 */ + 0x7c, 0x63, 0x18, 0xf8, /* not r3,r3 */ + 0x4e, 0x80, 0x00, 0x20, /* blr */ +}; + static void amigaone_cpu_reset(void *opaque) { PowerPCCPU *cpu = opaque; @@ -60,8 +69,6 @@ static void amigaone_init(MachineState *machine) PowerPCCPU *cpu; CPUPPCState *env; MemoryRegion *rom, *pci_mem, *mr; - const char *fwname = machine->firmware ?: PROM_FILENAME; - char *filename; ssize_t sz; PCIBus *pci_bus; Object *via; @@ -94,20 +101,24 @@ static void amigaone_init(MachineState *machine) } /* allocate and load firmware */ - filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, fwname); - if (filename) { - rom = g_new(MemoryRegion, 1); - memory_region_init_rom(rom, NULL, "rom", PROM_SIZE, &error_fatal); - memory_region_add_subregion(get_system_memory(), PROM_ADDR, rom); + rom = g_new(MemoryRegion, 1); + memory_region_init_rom(rom, NULL, "rom", PROM_SIZE, &error_fatal); + memory_region_add_subregion(get_system_memory(), PROM_ADDR, rom); + if (!machine->firmware) { + rom_add_blob_fixed("dummy-fw", dummy_fw, sizeof(dummy_fw), + PROM_ADDR + PROM_SIZE - 0x80); + } else { + g_autofree char *filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, + machine->firmware); + if (!filename) { + error_report("Could not find firmware '%s'", machine->firmware); + exit(1); + } sz = load_image_targphys(filename, PROM_ADDR, PROM_SIZE); if (sz <= 0 || sz > PROM_SIZE) { error_report("Could not load firmware '%s'", filename); exit(1); } - g_free(filename); - } else if (!qtest_enabled()) { - error_report("Could not find firmware '%s'", fwname); - exit(1); } /* Articia S */ -- 2.11.4.GIT