diff options
| author | Steven Le Rouzic <steven.lerouzic@gmail.com> | 2024-06-02 00:26:57 +0200 |
|---|---|---|
| committer | Steven Le Rouzic <steven.lerouzic@gmail.com> | 2024-06-02 00:26:57 +0200 |
| commit | 45f420a338ea02225bb8a98c9aca5eed8d6a23ae (patch) | |
| tree | 97fdb1c8e81ba79b101b928158e5e37fa938c8f3 /kernel/start.c | |
Initial commit
Diffstat (limited to 'kernel/start.c')
| -rw-r--r-- | kernel/start.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/start.c b/kernel/start.c new file mode 100644 index 0000000..b7170ae --- /dev/null +++ b/kernel/start.c @@ -0,0 +1,51 @@ +#include "kernel/lib.h"
+#include "kernel/riscv.h"
+#include "kernel/kalloc.h"
+#include "kernel/vm.h"
+#include "kernel/cpu.h"
+
+Cpu cpus[MAX_CPU];
+
+extern uint32_t _bss_start;
+extern uint32_t _bss_end;
+extern uint32_t _ram_end;
+
+void kstrap()
+{
+ panic("kstrap");
+}
+
+void kstart()
+{
+ kalloc_init();
+ kvm_init();
+
+ panic("kstart: end");
+}
+
+void kinit()
+{
+ // @Todo Initialize CPUs
+ Cpu null_cpu = {0};
+ cpus[0] = null_cpu;
+
+ // Clear the BSS section
+ for (uint32_t* ptr = &_bss_start; ptr < &_bss_end; ++ptr)
+ {
+ *ptr = 0U;
+ }
+
+ w_mideleg(0xFFFF);
+ w_medeleg(0xFFFF);
+
+ w_sstatus(SSTATUS_SPIE | SSTATUS_SPP_S);
+ w_sie(SIE_SEIE);
+ w_sepc(&kstart);
+ w_stvec(&kstrap);
+
+ w_pmpcfg0(PMPCFG_RW | PMPCFG_X | PMPCFG_TOR);
+ w_pmpaddr0(((uint32_t)&_ram_end) >> PMPADDR_SHIFT);
+
+ __asm__ volatile("sret");
+}
+
|