diff options
Diffstat (limited to 'arch/riscv64/kernel/proc.c')
| -rw-r--r-- | arch/riscv64/kernel/proc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/riscv64/kernel/proc.c b/arch/riscv64/kernel/proc.c index 66325ec..8653254 100644 --- a/arch/riscv64/kernel/proc.c +++ b/arch/riscv64/kernel/proc.c @@ -1,10 +1,12 @@ #include <apos/tcb.h> #include <apos/elf.h> +#include <regs.h> #include <csr.h> stat_t jump_to_userspace(struct tcb *t, int argc, char **argv) { csr_write(CSR_SEPC, t->entry); + csr_write(CSR_SSCRATCH, t); __asm__ volatile("mv sp, %0\n" ::"r"(t->proc_stack_top) : "memory"); __asm__ volatile("sret\n" ::: "memory"); /* we should never reach this */ @@ -16,3 +18,18 @@ stat_t return_to_userspace(struct tcb *t) /* lol */ return ERR_ADDR; } + +stat_t prepare_thread(struct tcb *t) +{ + /* get location of registers in memory */ + /* TODO: check alignment, should be fine but just to be sure */ + struct riscv_regs *r = (struct riscv_regs *)t; + r--; + + r->sp = (long)t->proc_stack_top; + r->tp = (long)t; + + /* set entry point */ + csr_write(CSR_SEPC, t->entry); + return OK; +} |