Commit ce3940cc authored by Matthew Fortune's avatar Matthew Fortune Committed by Aleksandar Markovic
Browse files

mips_malta: Add basic nanoMIPS boot code for Malta board 



Add basic nanoMIPS boot code for Malta.

Reviewed-by: default avatarAleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: default avatarYongbok Kim <yongbok.kim@mips.com>
Signed-off-by: default avatarAleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: default avatarStefan Markovic <smarkovic@wavecomp.com>
parent 722ac96c

hw/mips/mips_malta.c

+60 −3
Original line number Diff line number Diff line
@@ -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();



        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) +