diff options
| author | Matthew Fortune <matthew.fortune@mips.com> | 2018-08-02 16:16:42 +0200 |
|---|---|---|
| committer | Aleksandar Markovic <amarkovic@wavecomp.com> | 2018-08-24 17:51:59 +0200 |
| commit | ce3940ccca34b9290f77e5347523d40a4d9c9384 (patch) | |
| tree | d49f74924589b14a2d81ead1e37041bd566ee59d /hw/mips | |
| parent | 722ac96cd69e38cf9689d29bdd3535a0eb8b2b93 (diff) | |
mips_malta: Add basic nanoMIPS boot code for Malta board
Add basic nanoMIPS boot code for Malta.
Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Yongbok Kim <yongbok.kim@mips.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Stefan Markovic <smarkovic@wavecomp.com>
Diffstat (limited to 'hw/mips')
| -rw-r--r-- | hw/mips/mips_malta.c | 63 |
1 files changed, 60 insertions, 3 deletions
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c index 3467451482..2e851d9cf2 100644 --- a/hw/mips/mips_malta.c +++ b/hw/mips/mips_malta.c @@ -599,6 +599,59 @@ 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: */ + 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) */ + 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 +673,6 @@ 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 +1148,13 @@ 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) + |