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[kernel] Improve process init

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Move process init from each process needing a main.s with _start to
crt0.s in libc. Also change to a sysv-like initial stack with a
j6-specific array of initialization values after the program arguments.
This commit is contained in:
Justin C. Miller
2020-12-31 00:57:51 -08:00
parent db8a14720b
commit 0e6b27e741
8 changed files with 148 additions and 71 deletions
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61
src/kernel/scheduler.cpp
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@@ -1,5 +1,7 @@
#include <stddef.h>
#include <j6/init.h>
#include "apic.h"
#include "clock.h"
#include "console.h"
@@ -63,6 +65,14 @@ scheduler::scheduler(lapic *apic) :
bsp_cpu_data.t = idle;
}
template <typename T>
inline T * push(uintptr_t &rsp, size_t size = sizeof(T)) {
rsp -= size;
T *p = reinterpret_cast<T*>(rsp);
rsp &= ~(sizeof(uint64_t)-1); // Align the stack
return p;
}
uintptr_t
load_process_image(uintptr_t phys, uintptr_t virt, size_t bytes, TCB *tcb)
{
@@ -72,31 +82,60 @@ load_process_image(uintptr_t phys, uintptr_t virt, size_t bytes, TCB *tcb)
// We're now in the process space for this process, allocate memory for the
// process code and load it
process &proc = process::current();
thread &th = thread::current();
vm_space &space = proc.space();
vm_area *vma = new vm_area_open(bytes, space, vm_flags::zero|vm_flags::write);
space.add(virt, vma);
vma->commit(phys, 0, memory::page_count(bytes));
tcb->rsp3 -= 2 * sizeof(uint64_t);
uint64_t *sentinel = reinterpret_cast<uint64_t*>(tcb->rsp3);
sentinel[0] = sentinel[1] = 0;
// double zero stack sentinel
*push<uint64_t>(tcb->rsp3) = 0;
*push<uint64_t>(tcb->rsp3) = 0;
tcb->rsp3 -= sizeof(j6_process_init);
j6_process_init *init = reinterpret_cast<j6_process_init*>(tcb->rsp3);
const char message[] = "Hello from the kernel!";
char *message_arg = push<char>(tcb->rsp3, sizeof(message));
kutil::memcpy(message_arg, message, sizeof(message));
init->process = proc.add_handle(&proc);
init->handles[0] = proc.add_handle(system::get());
init->handles[1] = j6_handle_invalid;
init->handles[2] = j6_handle_invalid;
j6_init_framebuffer *fb_desc = push<j6_init_framebuffer>(tcb->rsp3);
fb_desc->addr = reinterpret_cast<void*>(0x100000000);
fb_desc->size = fb_size;
j6_init_value *initv = push<j6_init_value>(tcb->rsp3);
initv->type = j6_init_handle_system;
initv->value = static_cast<uint64_t>(proc.add_handle(system::get()));
initv = push<j6_init_value>(tcb->rsp3);
initv->type = j6_init_handle_process;
initv->value = static_cast<uint64_t>(proc.add_handle(&proc));
initv = push<j6_init_value>(tcb->rsp3);
initv->type = j6_init_handle_thread;
initv->value = static_cast<uint64_t>(proc.add_handle(&th));
initv = push<j6_init_value>(tcb->rsp3);
initv->type = j6_init_handle_space;
//initv->value = static_cast<uint64_t>(proc.add_handle(&space));
initv = push<j6_init_value>(tcb->rsp3);
initv->type = j6_init_desc_framebuffer;
initv->value = reinterpret_cast<uint64_t>(fb_desc);
uint64_t *initc = push<uint64_t>(tcb->rsp3);
*initc = 5;
char **argv0 = push<char*>(tcb->rsp3);
*argv0 = message_arg;
uint64_t *argc = push<uint64_t>(tcb->rsp3);
*argc = 1;
// Crazypants framebuffer part
init->handles[1] = reinterpret_cast<j6_handle_t>(fb_size);
vma = new vm_area_open(fb_size, space, vm_flags::write|vm_flags::mmio);
space.add(0x100000000, vma);
vma->commit(fb_loc, 0, memory::page_count(fb_size));
thread::current().clear_state(thread::state::loading);
th.clear_state(thread::state::loading);
return tcb->rsp3;
}