44 lines
1015 B
C
44 lines
1015 B
C
|
/*
|
||
|
|
* Supervisor-mode startup codes
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "riscv.h"
|
||
|
|
#include "string.h"
|
||
|
|
#include "elf.h"
|
||
|
|
#include "process.h"
|
||
|
|
|
||
|
|
#include "spike_interface/spike_utils.h"
|
||
|
|
|
||
|
|
process user_app;
|
||
|
|
|
||
|
|
//
|
||
|
|
// load the elf, and construct a "process" (with only a trapframe).
|
||
|
|
// load_bincode_from_host_elf is defined in elf.c
|
||
|
|
//
|
||
|
|
void load_user_program(process *proc) {
|
||
|
|
proc->trapframe = (trapframe *)USER_TRAP_FRAME;
|
||
|
|
memset(proc->trapframe, 0, sizeof(trapframe));
|
||
|
|
proc->kstack = USER_KSTACK;
|
||
|
|
proc->trapframe->regs.sp = USER_STACK;
|
||
|
|
|
||
|
|
load_bincode_from_host_elf(proc);
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// s_start: S-mode entry point of PKE OS kernel.
|
||
|
|
//
|
||
|
|
int s_start(void) {
|
||
|
|
sprint("Enter supervisor mode...\n");
|
||
|
|
// Note: we use direct (i.e., Bare mode) for memory mapping in lab1.
|
||
|
|
// which means: Virtual Address = Physical Address
|
||
|
|
write_csr(satp, 0);
|
||
|
|
|
||
|
|
// the application code (elf) is first loaded into memory, and then put into execution
|
||
|
|
load_user_program(&user_app);
|
||
|
|
|
||
|
|
sprint("Switch to user mode...\n");
|
||
|
|
switch_to(&user_app);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|