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-rw-r--r--coroutine/riscv64/Context.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/coroutine/riscv64/Context.h b/coroutine/riscv64/Context.h
new file mode 100644
index 0000000000..5ec03266b2
--- /dev/null
+++ b/coroutine/riscv64/Context.h
@@ -0,0 +1,45 @@
+#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)
+{
+}