From: Matthew Fortune <matthew.fort...@mips.com>
Add basic nanoMIPS boot code for Malta.
Signed-off-by: Yongbok Kim <yongbok....@mips.com>
Signed-off-by: Aleksandar Markovic <amarko...@wavecomp.com>
Signed-off-by: Stefan Markovic <smarko...@wavecomp.com>
---
hw/mips/mips_malta.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 60 insertions(+), 3 deletions(-)
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index 3467451..2e851d9 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) +
--
2.7.4
