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scheduler: umask default value and fpu saving in x86_64 context

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Matheus
2023-07-08 22:54:34 -03:00
parent 71a6833f52
commit c20d0e790f
2 changed files with 16 additions and 3 deletions
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kernel-src/include/x86-64/arch/context.h
+14 -3
View File
@@ -40,7 +40,9 @@ typedef struct {
typedef struct {
uint64_t gsbase;
uint64_t fsbase;
} extracontext_t;
uint8_t fx[512];
uint32_t mxcsr;
} extracontext_t __attribute__((aligned(16)));
#define CTX_INIT(x,u) \
if (u) { \
@@ -52,6 +54,9 @@ typedef struct {
} \
(x)->rflags = 0x200;
#define CTX_XINIT(x, u) \
(x)->mxcsr = 0x1F80; // all exceptions masked
#define CTX_SP(x) (x)->rsp
#define CTX_IP(x) (x)->rip
#define CTX_RET(x) (x)->rax
@@ -73,18 +78,24 @@ void arch_context_saveandcall(void (*fn)(context_t *context), void *stack);
_cpu()->ist.rsp0 = (uint64_t)(x)->kernelstacktop; \
wrmsr(MSR_KERNELGSBASE, (x)->extracontext.gsbase); \
wrmsr(MSR_FSBASE, (x)->extracontext.fsbase); \
asm("fxrstor (%%rax)" : : "a"(&(x)->extracontext.fx[0])); \
asm("ldmxcsr (%%rax)" : : "a"(&(x)->extracontext.mxcsr)); \
arch_context_switch(&thread->context);
#define ARCH_CONTEXT_THREADSAVE(t, c) \
memcpy(&(t)->context, c, sizeof(context_t)); \
(t)->extracontext.gsbase = rdmsr(MSR_KERNELGSBASE); \
(t)->extracontext.fsbase = rdmsr(MSR_FSBASE);
(t)->extracontext.fsbase = rdmsr(MSR_FSBASE); \
asm("fxsave (%%rax)" : : "a"(&(t)->extracontext.fx[0])); \
asm("stmxcsr (%%rax)" : : "a"(&(t)->extracontext.mxcsr));
#define ARCH_CONTEXT_THREADLOAD(t, c) \
memcpy(c, &(t)->context, sizeof(context_t)); \
_cpu()->ist.rsp0 = (uint64_t)(t)->kernelstacktop; \
wrmsr(MSR_KERNELGSBASE, (t)->extracontext.gsbase); \
wrmsr(MSR_FSBASE, (t)->extracontext.fsbase);
wrmsr(MSR_FSBASE, (t)->extracontext.fsbase); \
asm("fxrstor (%%rax)" : : "a"(&(t)->extracontext.fx[0])); \
asm("ldmxcsr (%%rax)" : : "a"(&(t)->extracontext.mxcsr));
#define ARCH_CONTEXT_INTSTATUS(x) ((x)->rflags & 0x200 ? true : false)
kernel-src/sys/scheduler.c
+2
View File
@@ -60,6 +60,7 @@ proc_t *sched_newproc() {
}
proc->pid = __atomic_fetch_add(&currpid, 1, __ATOMIC_SEQ_CST);
proc->umask = 022; // default umask
return proc;
}
@@ -86,6 +87,7 @@ thread_t *sched_newthread(void *ip, size_t kstacksize, int priority, proc_t *pro
CTX_INIT(&thread->context, proc != NULL);
CTX_XINIT(&thread->extracontext, proc != NULL);
CTX_SP(&thread->context) = proc ? (ctxreg_t)ustack : (ctxreg_t)thread->kernelstacktop;
CTX_IP(&thread->context) = (ctxreg_t)ip;
SPINLOCK_INIT(thread->sleeplock);