[coreboot-gerrit] Change in coreboot[master]: x86 gdb: Extend GDB stub with CPUID command

[Werner Zeh (Code Review)]

Werner Zeh has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/36018 )

Change subject: x86 gdb: Extend GDB stub with CPUID command
......................................................................

x86 gdb: Extend GDB stub with CPUID command

Add CPUID command to GDB stub.

NOT FOR MERGE!!!

Change-Id: I49a18c1fff01a139352acbac98a927f213ebcaa6
Signed-off-by: Werner Zeh 
---
M src/arch/x86/exception.c
1 file changed, 20 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/18/36018/1

diff --git a/src/arch/x86/exception.c b/src/arch/x86/exception.c
index 7d10c3e..4759015 100644
--- a/src/arch/x86/exception.c
+++ b/src/arch/x86/exception.c
@@ -602,6 +602,26 @@
    		break;
    	case 'q':  /* query */
    		break;
+		case 'u':
+			/* uAA..AA: Execute CPUID with EAX given by AA..AA. */
+			ptr = &in_buffer[1];
+			if (parse_ulong(&ptr, &addr) &&
+			    (*(ptr++) == ':')) {
+				char *out_ptr = out_buffer;
+				struct cpuid_result result;
+
+				result = cpuid(addr);
+				copy_to_hex(out_ptr, (void *)&(result.eax), 4);
+				out_ptr += (4 << 1);
+				copy_to_hex(out_ptr, (void *)&(result.ebx), 4);
+				out_ptr += (4 << 1);
+				copy_to_hex(out_ptr, (void *)&(result.ecx), 4);
+				out_ptr += (4 << 1);
+				copy_to_hex(out_ptr, (void *)&(result.edx), 4);
+				out_ptr += (4 << 1);
+			} else
+				memcpy(out_buffer, "E07", 4);
+			break;
    	case 'z':  /* z0AAAA,LLLL remove memory breakpoint */
    		   /* z1AAAA,LLLL remove hardware breakpoint */
    		   /* z2AAAA,LLLL remove write watchpoint */