From e24e58e8acdee80ecd5ee8279d56df53b0232a26 Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Thu, 2 Jan 2020 13:01:50 +0100 Subject: q800: implement mac rom reset function for BIOS-less mode On Linux, calling `reboot(RB_AUTOBOOT);` will result in arch/m68k/mac/misc.c's mac_reset function being called. That in turn looks at the rombase (or uses 0x40800000 is there's no rombase), adds 0xa, and jumps to that address. At the moment, there's nothing there, so the kernel just crashes when trying to reboot. So, this commit adds a very simple implementation at that location, which just writes to via2 to power down. We also correct the value of ROMBASE while we're at it. Signed-off-by: Jason A. Donenfeld Reviewed-by: Laurent Vivier Message-Id: <20200102120150.281082-1-Jason@zx2c4.com> Signed-off-by: Laurent Vivier --- hw/m68k/q800.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c index 0c445c7..0e5a08f 100644 --- a/hw/m68k/q800.c +++ b/hw/m68k/q800.c @@ -47,7 +47,7 @@ #include "sysemu/runstate.h" #include "sysemu/reset.h" -#define MACROM_ADDR 0x40000000 +#define MACROM_ADDR 0x40800000 #define MACROM_SIZE 0x00100000 #define MACROM_FILENAME "MacROM.bin" @@ -128,6 +128,27 @@ static void main_cpu_reset(void *opaque) cpu->env.pc = ldl_phys(cs->as, 4); } +static uint8_t fake_mac_rom[] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + + /* offset: 0xa - mac_reset */ + + /* via2[vDirB] |= VIA2B_vPower */ + 0x20, 0x7C, 0x50, 0xF0, 0x24, 0x00, /* moveal VIA2_BASE+vDirB,%a0 */ + 0x10, 0x10, /* moveb %a0@,%d0 */ + 0x00, 0x00, 0x00, 0x04, /* orib #4,%d0 */ + 0x10, 0x80, /* moveb %d0,%a0@ */ + + /* via2[vBufB] &= ~VIA2B_vPower */ + 0x20, 0x7C, 0x50, 0xF0, 0x20, 0x00, /* moveal VIA2_BASE+vBufB,%a0 */ + 0x10, 0x10, /* moveb %a0@,%d0 */ + 0x02, 0x00, 0xFF, 0xFB, /* andib #-5,%d0 */ + 0x10, 0x80, /* moveb %d0,%a0@ */ + + /* while (true) ; */ + 0x60, 0xFE /* bras [self] */ +}; + static void q800_init(MachineState *machine) { M68kCPU *cpu = NULL; @@ -346,6 +367,12 @@ static void q800_init(MachineState *machine) (graphic_width * graphic_depth + 7) / 8); BOOTINFO1(cs->as, parameters_base, BI_MAC_SCCBASE, SCC_BASE); + rom = g_malloc(sizeof(*rom)); + memory_region_init_ram_ptr(rom, NULL, "m68k_fake_mac.rom", + sizeof(fake_mac_rom), fake_mac_rom); + memory_region_set_readonly(rom, true); + memory_region_add_subregion(get_system_memory(), MACROM_ADDR, rom); + if (kernel_cmdline) { BOOTINFOSTR(cs->as, parameters_base, BI_COMMAND_LINE, kernel_cmdline); -- cgit v1.1