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[PATCH-for-8.0,v2,02/11] hw/mips/bootloader: Implement nanoMIPS NOP opcode generator

Message ID 20221211204533.85359-3-philmd@linaro.org (mailing list archive)
State New, archived
Headers show
Series hw/mips/malta: Generate nanoMIPS bootloader with bootloader generator API | expand

Commit Message

Philippe Mathieu-Daudé Dec. 11, 2022, 8:45 p.m. UTC 
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/mips/bootloader.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)
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Patch

diff --git a/hw/mips/bootloader.c b/hw/mips/bootloader.c
index 21ffd4d772..0035f37335 100644
--- a/hw/mips/bootloader.c
+++ b/hw/mips/bootloader.c
@@ -54,14 +54,30 @@  static bool bootcpu_supports_isa(uint64_t isa_mask)
     return cpu_supports_isa(&MIPS_CPU(first_cpu)->env, isa_mask);
 }
 
+static void st_nm32_p(void **ptr, uint32_t insn)
+{
+    uint16_t *p = *ptr;
+
+    stw_p(p, insn >> 16);
+    p++;
+    stw_p(p, insn >> 0);
+    p++;
+
+    *ptr = p;
+}
+
 /* Base types */
 static void bl_gen_nop(void **ptr)
 {
-    uint32_t *p = *ptr;
+    if (bootcpu_supports_isa(ISA_NANOMIPS32)) {
+        st_nm32_p(ptr, 0x8000c000);
+    } else {
+        uint32_t *p = *ptr;
 
-    stl_p(p, 0);
-    p++;
-    *ptr = p;
+        stl_p(p, 0);
+        p++;
+        *ptr = p;
+    }
 }
 
 static void bl_gen_r_type(void **ptr, uint8_t opcode,