diff options
| author | Angel Pons <th3fanbus@gmail.com> | 2021-11-03 16:03:45 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-11-05 12:39:12 +0000 |
| commit | 81beeae96034af5a4112180fba6e3a9a7ce4b42f (patch) | |
| tree | 78a1faad649f919caf6a92514af9d518f476c8a8 | |
| parent | d453da268dbbb1c3b758904c62b3d1a0f8754a08 (diff) | |
soc/intel/denverton_ns: Refactor `detect_num_cpus_via_cpuid()`
Rewrite level type check and use unsigned types. In addition, also use
unsigned types in the `get_cpu_count()` function.
Change-Id: I63f236f0f94f9412ec03ae25781befe619cf7c1f
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58913
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
| -rw-r--r-- | src/soc/intel/denverton_ns/cpu.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/src/soc/intel/denverton_ns/cpu.c b/src/soc/intel/denverton_ns/cpu.c index 44cb297c6a..126a1c651f 100644 --- a/src/soc/intel/denverton_ns/cpu.c +++ b/src/soc/intel/denverton_ns/cpu.c @@ -162,21 +162,20 @@ static void get_smm_info(uintptr_t *perm_smbase, size_t *perm_smsize, *smm_save_state_size = sizeof(em64t100_smm_state_save_area_t); } -static int detect_num_cpus_via_cpuid(void) +static unsigned int detect_num_cpus_via_cpuid(void) { - register int ecx = 0; - struct cpuid_result leaf_b; + unsigned int ecx = 0; while (1) { - leaf_b = cpuid_ext(0xb, ecx); + const struct cpuid_result leaf_b = cpuid_ext(0xb, ecx); /* Processor doesn't have hyperthreading so just determine the - * number of cores by from level type (ecx[15:8] == * 2). */ - if ((leaf_b.ecx & 0xff00) == 0x0200) - break; + number of cores from level type (ecx[15:8] == 2). */ + if ((leaf_b.ecx >> 8 & 0xff) == 2) + return leaf_b.ebx & 0xffff; + ecx++; } - return (leaf_b.ebx & 0xffff); } static int detect_num_cpus_via_mch(void) @@ -209,11 +208,11 @@ static int detect_num_cpus_via_mch(void) /* Find CPU topology */ int get_cpu_count(void) { - int num_cpus = detect_num_cpus_via_mch(); + unsigned int num_cpus = detect_num_cpus_via_mch(); - if (num_cpus <= 0 || num_cpus > CONFIG_MAX_CPUS) { + if (num_cpus == 0 || num_cpus > CONFIG_MAX_CPUS) { num_cpus = detect_num_cpus_via_cpuid(); - printk(BIOS_DEBUG, "Number of Cores (CPUID): %d.\n", num_cpus); + printk(BIOS_DEBUG, "Number of Cores (CPUID): %u.\n", num_cpus); } return num_cpus; } |