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#pragma once
#include "types.h"
#include "mm/pagetable.h"
/*
* The function pointer to be implemented by functions which are entry
* points for new threads.
*/
typedef void *(*context_func_t)(long, void *);
typedef struct context
{
uintptr_t c_rip; /* instruction pointer (RIP) */
uintptr_t c_rsp; /* stack pointer (RSP) */
uintptr_t c_rbp; /* frame pointer (RBP) */
pml4_t
*c_pml4; /* pointer to the top level page table (PML4) for this proc.
It's the 'root' of the page table where virtual address -> physical address
lookup starts. */
uintptr_t c_kstack;
size_t c_kstacksz;
} context_t;
/**
* Initialize the given context such that when it begins execution it
* will execute func(arg1,arg2). A kernel stack and page directory
* exclusive to this context must also be provided.
*
* @param c the context to initialize
* @param func the function which will begin executing when this
* context is first made active
* @param arg1 the first argument to func
* @param arg2 the second argument to func
* @param kstack a pointer to the kernel stack this context will use
* @param kstacksz the size of the kernel stack
* @param pdptr the pagetable this context will use
*/
void context_setup(context_t *c, context_func_t func, long arg1, void *arg2,
void *kstack, size_t kstacksz, pml4_t *pml4);
void context_setup_raw(context_t *c, void (*func)(), void *kstack,
size_t kstacksz, pml4_t *pml4);
/**
* Makes the given context the one currently running on the CPU. Use
* this mainly for the initial context.
*
* @param c the context to make active
*/
void context_make_active(context_t *c);
/**
* Save the current state of the machine into the old context, and begin
* executing the new context. Used primarily by the scheduler.
*
* @param oldc the context to switch from
* @param newc the context to switch to
*/
void context_switch(context_t *oldc, context_t *newc);
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