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[v1.06][RISCV] Support for fetching mvendorid, marchid and mimpid (#286)

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Getting these 3 RISC-V cpuinfo fields allows the detection of
microarchitecture (and other information), extending the RISC-V
detection capabilities. In particular, this is used here to detect
the marchid of Spacemit X60 uarch.

This commit also changes how the microarchitecture is fetched
(i.e., get_uarch) so that it does not rely only in the uarch field
in cpuinfo, but also on the marchid value.
This commit is contained in:
Dr-Noob
2024-10-10 08:33:01 +01:00
parent 2df8aa8217
commit 65c75eb443
6 changed files with 109 additions and 14 deletions
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7
src/riscv/riscv.c
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@@ -101,8 +101,8 @@ struct extensions* get_extensions_from_str(char* str) {
return ext;
}
int len = strlen(str);
ext->str = ecalloc(len+1, sizeof(char));
int len = strlen(str)+1;
ext->str = emalloc(len * sizeof(char));
strncpy(ext->str, str, sizeof(char) * len);
// Code inspired in Linux kernel (riscv_fill_hwcap):
@@ -157,13 +157,12 @@ struct cpuInfo* get_cpu_info(void) {
topo->cach = NULL;
cpu->topo = topo;
char* cpuinfo_str = get_uarch_from_cpuinfo();
char* ext_str = get_extensions_from_cpuinfo();
cpu->hv = emalloc(sizeof(struct hypervisor));
cpu->hv->present = false;
cpu->ext = get_extensions_from_str(ext_str);
if(cpu->ext->str != NULL && cpu->ext->mask == 0) return NULL;
cpu->arch = get_uarch_from_cpuinfo_str(cpuinfo_str, cpu);
cpu->arch = get_uarch(cpu);
cpu->soc = get_soc(cpu);
cpu->freq = get_frequency_info(0);
cpu->peak_performance = get_peak_performance(cpu);