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- /* Basic PCID & INVPCID functionality test */
- #include "libcflat.h"
- #include "processor.h"
- #include "desc.h"
- #define X86_FEATURE_PCID (1 << 17)
- #define X86_FEATURE_INVPCID (1 << 10)
- struct invpcid_desc {
- unsigned long pcid : 12;
- unsigned long rsv : 52;
- unsigned long addr : 64;
- };
- int write_cr0_checking(unsigned long val)
- {
- asm volatile(ASM_TRY("1f")
- "mov %0, %%cr0\n\t"
- "1:": : "r" (val));
- return exception_vector();
- }
- int write_cr4_checking(unsigned long val)
- {
- asm volatile(ASM_TRY("1f")
- "mov %0, %%cr4\n\t"
- "1:": : "r" (val));
- return exception_vector();
- }
- int invpcid_checking(unsigned long type, void *desc)
- {
- asm volatile (ASM_TRY("1f")
- ".byte 0x66,0x0f,0x38,0x82,0x18 \n\t" /* invpcid (%rax), %rbx */
- "1:" : : "a" (desc), "b" (type));
- return exception_vector();
- }
- void test_cpuid_consistency(int pcid_enabled, int invpcid_enabled)
- {
- int passed = !(!pcid_enabled && invpcid_enabled);
- report("CPUID consistency", passed);
- }
- void test_pcid_enabled(void)
- {
- int passed = 0;
- ulong cr0 = read_cr0(), cr3 = read_cr3(), cr4 = read_cr4();
- /* try setting CR4.PCIDE, no exception expected */
- if (write_cr4_checking(cr4 | X86_CR4_PCIDE) != 0)
- goto report;
- /* try clearing CR0.PG when CR4.PCIDE=1, #GP expected */
- if (write_cr0_checking(cr0 & ~X86_CR0_PG) != GP_VECTOR)
- goto report;
- write_cr4(cr4);
- /* try setting CR4.PCIDE when CR3[11:0] != 0 , #GP expected */
- write_cr3(cr3 | 0x001);
- if (write_cr4_checking(cr4 | X86_CR4_PCIDE) != GP_VECTOR)
- goto report;
- write_cr3(cr3);
- passed = 1;
- report:
- report("Test on PCID when enabled", passed);
- }
- void test_pcid_disabled(void)
- {
- int passed = 0;
- ulong cr4 = read_cr4();
- /* try setting CR4.PCIDE, #GP expected */
- if (write_cr4_checking(cr4 | X86_CR4_PCIDE) != GP_VECTOR)
- goto report;
- passed = 1;
- report:
- report("Test on PCID when disabled", passed);
- }
- void test_invpcid_enabled(void)
- {
- int passed = 0;
- ulong cr4 = read_cr4();
- struct invpcid_desc desc;
- desc.rsv = 0;
- /* try executing invpcid when CR4.PCIDE=0, desc.pcid=0 and type=1
- * no exception expected
- */
- desc.pcid = 0;
- if (invpcid_checking(1, &desc) != 0)
- goto report;
- /* try executing invpcid when CR4.PCIDE=0, desc.pcid=1 and type=1
- * #GP expected
- */
- desc.pcid = 1;
- if (invpcid_checking(1, &desc) != GP_VECTOR)
- goto report;
- if (write_cr4_checking(cr4 | X86_CR4_PCIDE) != 0)
- goto report;
- /* try executing invpcid when CR4.PCIDE=1
- * no exception expected
- */
- desc.pcid = 10;
- if (invpcid_checking(2, &desc) != 0)
- goto report;
- passed = 1;
- report:
- report("Test on INVPCID when enabled", passed);
- }
- void test_invpcid_disabled(void)
- {
- int passed = 0;
- struct invpcid_desc desc;
- /* try executing invpcid, #UD expected */
- if (invpcid_checking(2, &desc) != UD_VECTOR)
- goto report;
- passed = 1;
- report:
- report("Test on INVPCID when disabled", passed);
- }
- int main(int ac, char **av)
- {
- struct cpuid _cpuid;
- int pcid_enabled = 0, invpcid_enabled = 0;
- setup_idt();
- _cpuid = cpuid(1);
- if (_cpuid.c & X86_FEATURE_PCID)
- pcid_enabled = 1;
- _cpuid = cpuid_indexed(7, 0);
- if (_cpuid.b & X86_FEATURE_INVPCID)
- invpcid_enabled = 1;
- test_cpuid_consistency(pcid_enabled, invpcid_enabled);
- if (pcid_enabled)
- test_pcid_enabled();
- else
- test_pcid_disabled();
- if (invpcid_enabled)
- test_invpcid_enabled();
- else
- test_invpcid_disabled();
- return report_summary();
- }
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