hw/mips/boston: Use bootloader helper to set GCRs

Translate embedded assembly into IO writes which is more
readable.

Also hardcode cm_base at boot time instead of reading from CP0.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210127065424.114125-5-jiaxun.yang@flygoat.com>
[PMD: Kept code comments]
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

hw/mips/boston.c

@@ -274,48 +274,26 @@ static void boston_register_types(void)
 }
 type_init(boston_register_types)
 
-static void gen_firmware(uint32_t *p, hwaddr kernel_entry, hwaddr fdt_addr,
-                         bool is_64b)
+static void gen_firmware(uint32_t *p, hwaddr kernel_entry, hwaddr fdt_addr)
 {
     const uint32_t cm_base = 0x16100000;
     const uint32_t gic_base = 0x16120000;
     const uint32_t cpc_base = 0x16200000;
 
     /* Move CM GCRs */
-    if (is_64b) {
-        stl_p(p++, 0x40287803);                 /* dmfc0 $8, CMGCRBase */
-        stl_p(p++, 0x00084138);                 /* dsll $8, $8, 4 */
-    } else {
-        stl_p(p++, 0x40087803);                 /* mfc0 $8, CMGCRBase */
-        stl_p(p++, 0x00084100);                 /* sll  $8, $8, 4 */
-    }
-    stl_p(p++, 0x3c09a000);                     /* lui  $9, 0xa000 */
-    stl_p(p++, 0x01094025);                     /* or   $8, $9 */
-    stl_p(p++, 0x3c0a0000 | (cm_base >> 16));   /* lui  $10, cm_base >> 16 */
-    if (is_64b) {
-        stl_p(p++, 0xfd0a0008);                 /* sd   $10, 0x8($8) */
-    } else {
-        stl_p(p++, 0xad0a0008);                 /* sw   $10, 0x8($8) */
-    }
-    stl_p(p++, 0x012a4025);                     /* or   $8, $10 */
+    bl_gen_write_ulong(&p,
+                       cpu_mips_phys_to_kseg1(NULL, GCR_BASE_ADDR + GCR_BASE_OFS),
+                       cm_base);
 
     /* Move & enable GIC GCRs */
-    stl_p(p++, 0x3c090000 | (gic_base >> 16));  /* lui  $9, gic_base >> 16 */
-    stl_p(p++, 0x35290001);                     /* ori  $9, 0x1 */
-    if (is_64b) {
-        stl_p(p++, 0xfd090080);                 /* sd   $9, 0x80($8) */
-    } else {
-        stl_p(p++, 0xad090080);                 /* sw   $9, 0x80($8) */
-    }
+    bl_gen_write_ulong(&p,
+                       cpu_mips_phys_to_kseg1(NULL, cm_base + GCR_GIC_BASE_OFS),
+                       gic_base | GCR_GIC_BASE_GICEN_MSK);
 
     /* Move & enable CPC GCRs */
-    stl_p(p++, 0x3c090000 | (cpc_base >> 16));  /* lui  $9, cpc_base >> 16 */
-    stl_p(p++, 0x35290001);                     /* ori  $9, 0x1 */
-    if (is_64b) {
-        stl_p(p++, 0xfd090088);                 /* sd   $9, 0x88($8) */
-    } else {
-        stl_p(p++, 0xad090088);                 /* sw   $9, 0x88($8) */
-    }
+    bl_gen_write_ulong(&p,
+                       cpu_mips_phys_to_kseg1(NULL, cm_base + GCR_CPC_BASE_OFS),
+                       cpc_base | GCR_CPC_BASE_CPCEN_MSK);
 
     /*
      * Setup argument registers to follow the UHI boot protocol:
@@ -529,8 +507,7 @@ static void boston_mach_init(MachineState *machine)
         }
 
         gen_firmware(memory_region_get_ram_ptr(flash) + 0x7c00000,
-                     s->kernel_entry, s->fdt_base,
-                     cpu_type_is_64bit(machine->cpu_type));
+                     s->kernel_entry, s->fdt_base);
     } else if (!qtest_enabled()) {
         error_report("Please provide either a -kernel or -bios argument");
         exit(1);