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/** @file task.H
* @brief Defines kernel information about tasks.
*/
#ifndef __KERNEL_TASK_H
#define __KERNEL_TASK_H
#include <kernel/types.h>
/** @struct context_t
* @brief Defines the save-restore context for the task.
*
* See PowerISA for information on registers listed.
*/
struct context_t
{
void* stack_ptr;
void* nip;
uint64_t gprs[32];
uint64_t lr;
uint64_t cr;
uint64_t ctr;
uint64_t xer;
};
/** @struct task_t
* @brief The kernel-level task structure.
*/
struct task_t
{
/** Pointer to the CPU this task is assigned to. */
cpu_t* cpu;
/** Context information. This MUST stay here due to
* save-restore asm code. */
context_t context;
/** Task ID */
tid_t tid;
/** Determines if user-space would like this task pinned to a CPU.
* This value is considered a count of the number of times the pinned
* as been requested, so pinning can be used recursively. */
uint64_t affinity_pinned;
// Pointers for queue containers.
task_t* prev;
task_t* next;
};
enum { TASK_DEFAULT_STACK_SIZE = 4 };
// Macros for manipulating task's saved contexts.
#define TASK_GETARGN(t, n) (t->context.gprs[n+4])
#define TASK_GETARG0(t) (TASK_GETARGN(t,0))
#define TASK_GETARG1(t) (TASK_GETARGN(t,1))
#define TASK_GETARG2(t) (TASK_GETARGN(t,2))
#define TASK_GETARG3(t) (TASK_GETARGN(t,3))
#define TASK_GETARG4(t) (TASK_GETARGN(t,4))
#define TASK_GETARG5(t) (TASK_GETARGN(t,5))
#define TASK_GETARG6(t) (TASK_GETARGN(t,6))
#define TASK_GETARG7(t) (TASK_GETARGN(t,7))
#define TASK_SETRTN(t, n) (t->context.gprs[3] = (n))
#endif
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