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Support for native riscv64 coroutines.

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This commit is contained in:
Samuel Williams 2021-03-30 18:46:24 +13:00
parent 3d32c21758
commit b507f65d44
Notes: git 2021-03-30 15:23:38 +09:00
3 changed files with 135 additions and 0 deletions
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45
coroutine/riscv64/Context.h Normal file
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#pragma once
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#define COROUTINE __attribute__((noreturn)) void
enum {COROUTINE_REGISTERS = 0xd0 / 8};
struct coroutine_context
{
void **stack_pointer;
};
typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
static inline void coroutine_initialize_main(struct coroutine_context * context) {
context->stack_pointer = NULL;
}
static inline void coroutine_initialize(
struct coroutine_context *context,
coroutine_start start,
void *stack,
size_t size
) {
assert(start && stack && size >= 1024);
// Stack grows down. Force 16-byte alignment.
char * top = (char*)stack + size;
context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
context->stack_pointer[0xc0 / 8] = (void*)start;
}
struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
static inline void coroutine_destroy(struct coroutine_context * context)
{
}