diff options
Diffstat (limited to 'hw/mips/mips_malta.c')
| -rw-r--r-- | hw/mips/mips_malta.c | 212 |
1 files changed, 209 insertions, 3 deletions
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c index 3467451482..40041d5ec0 100644 --- a/hw/mips/mips_malta.c +++ b/hw/mips/mips_malta.c @@ -599,6 +599,208 @@ static void network_init(PCIBus *pci_bus) } } +static void write_bootloader_nanomips(uint8_t *base, int64_t run_addr, + int64_t kernel_entry) +{ + uint16_t *p; + + /* Small bootloader */ + p = (uint16_t *)base; + +#define NM_HI1(VAL) (((VAL) >> 16) & 0x1f) +#define NM_HI2(VAL) \ + (((VAL) & 0xf000) | (((VAL) >> 19) & 0xffc) | (((VAL) >> 31) & 0x1)) +#define NM_LO(VAL) ((VAL) & 0xfff) + + stw_p(p++, 0x2800); stw_p(p++, 0x001c); + /* bc to_here */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + + /* to_here: */ + if (semihosting_get_argc()) { + /* Preserve a0 content as arguments have been passed */ + stw_p(p++, 0x8000); stw_p(p++, 0xc000); + /* nop */ + } else { + stw_p(p++, 0x0080); stw_p(p++, 0x0002); + /* li a0,2 */ + } + + stw_p(p++, 0xe3a0 | NM_HI1(ENVP_ADDR - 64)); + + stw_p(p++, NM_HI2(ENVP_ADDR - 64)); + /* lui sp,%hi(ENVP_ADDR - 64) */ + + stw_p(p++, 0x83bd); stw_p(p++, NM_LO(ENVP_ADDR - 64)); + /* ori sp,sp,%lo(ENVP_ADDR - 64) */ + + stw_p(p++, 0xe0a0 | NM_HI1(ENVP_ADDR)); + + stw_p(p++, NM_HI2(ENVP_ADDR)); + /* lui a1,%hi(ENVP_ADDR) */ + + stw_p(p++, 0x80a5); stw_p(p++, NM_LO(ENVP_ADDR)); + /* ori a1,a1,%lo(ENVP_ADDR) */ + + stw_p(p++, 0xe0c0 | NM_HI1(ENVP_ADDR + 8)); + + stw_p(p++, NM_HI2(ENVP_ADDR + 8)); + /* lui a2,%hi(ENVP_ADDR + 8) */ + + stw_p(p++, 0x80c6); stw_p(p++, NM_LO(ENVP_ADDR + 8)); + /* ori a2,a2,%lo(ENVP_ADDR + 8) */ + + stw_p(p++, 0xe0e0 | NM_HI1(loaderparams.ram_low_size)); + + stw_p(p++, NM_HI2(loaderparams.ram_low_size)); + /* lui a3,%hi(loaderparams.ram_low_size) */ + + stw_p(p++, 0x80e7); stw_p(p++, NM_LO(loaderparams.ram_low_size)); + /* ori a3,a3,%lo(loaderparams.ram_low_size) */ + + /* + * Load BAR registers as done by YAMON: + * + * - set up PCI0 I/O BARs from 0x18000000 to 0x181fffff + * - set up PCI0 MEM0 at 0x10000000, size 0x8000000 + * - set up PCI0 MEM1 at 0x18200000, size 0xbe00000 + * + */ + stw_p(p++, 0xe040); stw_p(p++, 0x0681); + /* lui t1, %hi(0xb4000000) */ + +#ifdef TARGET_WORDS_BIGENDIAN + + stw_p(p++, 0xe020); stw_p(p++, 0x0be1); + /* lui t0, %hi(0xdf000000) */ + + /* 0x68 corresponds to GT_ISD (from hw/mips/gt64xxx_pci.c) */ + stw_p(p++, 0x8422); stw_p(p++, 0x9068); + /* sw t0, 0x68(t1) */ + + stw_p(p++, 0xe040); stw_p(p++, 0x077d); + /* lui t1, %hi(0xbbe00000) */ + + stw_p(p++, 0xe020); stw_p(p++, 0x0801); + /* lui t0, %hi(0xc0000000) */ + + /* 0x48 corresponds to GT_PCI0IOLD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9048); + /* sw t0, 0x48(t1) */ + + stw_p(p++, 0xe020); stw_p(p++, 0x0800); + /* lui t0, %hi(0x40000000) */ + + /* 0x50 corresponds to GT_PCI0IOHD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9050); + /* sw t0, 0x50(t1) */ + + stw_p(p++, 0xe020); stw_p(p++, 0x0001); + /* lui t0, %hi(0x80000000) */ + + /* 0x58 corresponds to GT_PCI0M0LD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9058); + /* sw t0, 0x58(t1) */ + + stw_p(p++, 0xe020); stw_p(p++, 0x07e0); + /* lui t0, %hi(0x3f000000) */ + + /* 0x60 corresponds to GT_PCI0M0HD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9060); + /* sw t0, 0x60(t1) */ + + stw_p(p++, 0xe020); stw_p(p++, 0x0821); + /* lui t0, %hi(0xc1000000) */ + + /* 0x80 corresponds to GT_PCI0M1LD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9080); + /* sw t0, 0x80(t1) */ + + stw_p(p++, 0xe020); stw_p(p++, 0x0bc0); + /* lui t0, %hi(0x5e000000) */ + +#else + + stw_p(p++, 0x0020); stw_p(p++, 0x00df); + /* addiu[32] t0, $0, 0xdf */ + + /* 0x68 corresponds to GT_ISD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9068); + /* sw t0, 0x68(t1) */ + + /* Use kseg2 remapped address 0x1be00000 */ + stw_p(p++, 0xe040); stw_p(p++, 0x077d); + /* lui t1, %hi(0xbbe00000) */ + + stw_p(p++, 0x0020); stw_p(p++, 0x00c0); + /* addiu[32] t0, $0, 0xc0 */ + + /* 0x48 corresponds to GT_PCI0IOLD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9048); + /* sw t0, 0x48(t1) */ + + stw_p(p++, 0x0020); stw_p(p++, 0x0040); + /* addiu[32] t0, $0, 0x40 */ + + /* 0x50 corresponds to GT_PCI0IOHD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9050); + /* sw t0, 0x50(t1) */ + + stw_p(p++, 0x0020); stw_p(p++, 0x0080); + /* addiu[32] t0, $0, 0x80 */ + + /* 0x58 corresponds to GT_PCI0M0LD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9058); + /* sw t0, 0x58(t1) */ + + stw_p(p++, 0x0020); stw_p(p++, 0x003f); + /* addiu[32] t0, $0, 0x3f */ + + /* 0x60 corresponds to GT_PCI0M0HD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9060); + /* sw t0, 0x60(t1) */ + + stw_p(p++, 0x0020); stw_p(p++, 0x00c1); + /* addiu[32] t0, $0, 0xc1 */ + + /* 0x80 corresponds to GT_PCI0M1LD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9080); + /* sw t0, 0x80(t1) */ + + stw_p(p++, 0x0020); stw_p(p++, 0x005e); + /* addiu[32] t0, $0, 0x5e */ + +#endif + + /* 0x88 corresponds to GT_PCI0M1HD */ + stw_p(p++, 0x8422); stw_p(p++, 0x9088); + /* sw t0, 0x88(t1) */ + + stw_p(p++, 0xe320 | NM_HI1(kernel_entry)); + + stw_p(p++, NM_HI2(kernel_entry)); + /* lui t9,%hi(kernel_entry) */ + + stw_p(p++, 0x8339); stw_p(p++, NM_LO(kernel_entry)); + /* ori t9,t9,%lo(kernel_entry) */ + + stw_p(p++, 0x4bf9); stw_p(p++, 0x0000); + /* jalrc t8 */ +} + /* ROM and pseudo bootloader The following code implements a very very simple bootloader. It first @@ -620,7 +822,6 @@ static void network_init(PCIBus *pci_bus) a2 - 32-bit address of the environment variables table a3 - RAM size in bytes */ - static void write_bootloader(uint8_t *base, int64_t run_addr, int64_t kernel_entry) { @@ -1096,8 +1297,13 @@ void mips_malta_init(MachineState *machine) loaderparams.initrd_filename = initrd_filename; kernel_entry = load_kernel(); - write_bootloader(memory_region_get_ram_ptr(bios), - bootloader_run_addr, kernel_entry); + if (!cpu_supports_isa(machine->cpu_type, ISA_NANOMIPS32)) { + write_bootloader(memory_region_get_ram_ptr(bios), + bootloader_run_addr, kernel_entry); + } else { + write_bootloader_nanomips(memory_region_get_ram_ptr(bios), + bootloader_run_addr, kernel_entry); + } if (kvm_enabled()) { /* Write the bootloader code @ the end of RAM, 1MB reserved */ write_bootloader(memory_region_get_ram_ptr(ram_low_preio) + |