[U-Boot] [PATCH v5 017/101] x86: Drop unnecessary cpu code for TPL

[Simon Glass]

We don't need to know every detail about the CPU in TPL. Drop some
superfluous functions to reduce code size. Add a simple CPU detection
algorithm which just supports Intel and AMD, since we only support TPL
on Intel, so far.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v5: None
Changes in v4:
- Drop 'if (0)' call to deep_magic_nexgen_probe() and use #ifndef instead
- Fix 'what' typo

Changes in v3: None
Changes in v2: None

 arch/x86/cpu/cpu.c      |  4 ++++
 arch/x86/cpu/i386/cpu.c | 41 +++++++++++++++++++++++++++++++++++++----
 2 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 9ee4b0294a..4795863b33 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -45,6 +45,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#ifndef CONFIG_TPL_BUILD
 static const char *const x86_vendor_name[] = {
 	[X86_VENDOR_INTEL]     = "Intel",
 	[X86_VENDOR_CYRIX]     = "Cyrix",
@@ -57,6 +58,7 @@ static const char *const x86_vendor_name[] = {
 	[X86_VENDOR_NSC]       = "NSC",
 	[X86_VENDOR_SIS]       = "SiS",
 };
+#endif
 
 int __weak x86_cleanup_before_linux(void)
 {
@@ -113,6 +115,7 @@ int icache_status(void)
 	return 1;
 }
 
+#ifndef CONFIG_TPL_BUILD
 const char *cpu_vendor_name(int vendor)
 {
 	const char *name;
@@ -123,6 +126,7 @@ const char *cpu_vendor_name(int vendor)
 
 	return name;
 }
+#endif
 
 char *cpu_get_name(char *name)
 {
diff --git a/arch/x86/cpu/i386/cpu.c b/arch/x86/cpu/i386/cpu.c
index 31663714a0..1b0ca0c90b 100644
--- a/arch/x86/cpu/i386/cpu.c
+++ b/arch/x86/cpu/i386/cpu.c
@@ -20,6 +20,7 @@
 
 #include <common.h>
 #include <malloc.h>
+#include <spl.h>
 #include <asm/control_regs.h>
 #include <asm/cpu.h>
 #include <asm/mp.h>
@@ -57,6 +58,8 @@ struct cpuinfo_x86 {
 	uint8_t x86_mask;
 };
 
+/* gcc 7.3 does not wwant to drop x86_vendors, so use #ifdef */
+#ifndef CONFIG_TPL_BUILD
 /*
  * List of cpu vendor strings along with their normalized
  * id values.
@@ -77,6 +80,7 @@ static const struct {
 	{ X86_VENDOR_NSC,       "Geode by NSC", },
 	{ X86_VENDOR_SIS,       "SiS SiS SiS ", },
 };
+#endif
 
 static void load_ds(u32 segment)
 {
@@ -198,6 +202,7 @@ static inline int test_cyrix_52div(void)
 	return (unsigned char) (test >> 8) == 0x02;
 }
 
+#ifndef CONFIG_TPL_BUILD
 /*
  *	Detect a NexGen CPU running without BIOS hypercode new enough
  *	to have CPUID. (Thanks to Herbert Oppmann)
@@ -218,6 +223,7 @@ static int deep_magic_nexgen_probe(void)
 		: "=a" (ret) : : "cx", "dx");
 	return  ret;
 }
+#endif
 
 static bool has_cpuid(void)
 {
@@ -229,6 +235,7 @@ static bool has_mtrr(void)
 	return cpuid_edx(0x00000001) & (1 << 12) ? true : false;
 }
 
+#ifndef CONFIG_TPL_BUILD
 static int build_vendor_name(char *vendor_name)
 {
 	struct cpuid_result result;
@@ -241,14 +248,40 @@ static int build_vendor_name(char *vendor_name)
 
 	return result.eax;
 }
+#endif
 
 static void identify_cpu(struct cpu_device_id *cpu)
 {
+	cpu->device = 0; /* fix gcc 4.4.4 warning */
+
+	/*
+	 * Do a quick and dirty check to save space - Intel and AMD only and
+	 * just the vendor. This is enough for most TPL code.
+	 */
+	if (spl_phase() == PHASE_TPL) {
+		struct cpuid_result result;
+
+		result = cpuid(0x00000000);
+		switch (result.ecx >> 24) {
+		case 'l': /* GenuineIntel */
+			cpu->vendor = X86_VENDOR_INTEL;
+			break;
+		case 'D': /* AuthenticAMD */
+			cpu->vendor = X86_VENDOR_AMD;
+			break;
+		default:
+			cpu->vendor = X86_VENDOR_ANY;
+			break;
+		}
+		return;
+	}
+
+/* gcc 7.3 does not want to drop x86_vendors, so use #ifdef */
+#ifndef CONFIG_TPL_BUILD
 	char vendor_name[16];
 	int i;
 
 	vendor_name[0] = '\0'; /* Unset */
-	cpu->device = 0; /* fix gcc 4.4.4 warning */
 
 	/* Find the id and vendor_name */
 	if (!has_cpuid()) {
@@ -264,9 +297,8 @@ static void identify_cpu(struct cpu_device_id *cpu)
 		/* Detect NexGen with old hypercode */
 		else if (deep_magic_nexgen_probe())
 			memcpy(vendor_name, "NexGenDriven", 13);
-	}
-	if (has_cpuid()) {
-		int  cpuid_level;
+	} else {
+		int cpuid_level;
 
 		cpuid_level = build_vendor_name(vendor_name);
 		vendor_name[12] = '\0';
@@ -286,6 +318,7 @@ static void identify_cpu(struct cpu_device_id *cpu)
 			break;
 		}
 	}
+#endif
 }
 
 static inline void get_fms(struct cpuinfo_x86 *c, uint32_t tfms)
-- 
2.24.0.432.g9d3f5f5b63-goog