minix/kernel/table.c
Philip Homburg 93fc19de2c The priority of FS should be lower than that of PM to avoid race conditions
when processes are killed due to a signal.
2005-07-27 11:48:13 +00:00

112 lines
5 KiB
C
Executable file

/* The object file of "table.c" contains most kernel data. Variables that
* are declared in the *.h files appear with EXTERN in front of them, as in
*
* EXTERN int x;
*
* Normally EXTERN is defined as extern, so when they are included in another
* file, no storage is allocated. If EXTERN were not present, but just say,
*
* int x;
*
* then including this file in several source files would cause 'x' to be
* declared several times. While some linkers accept this, others do not,
* so they are declared extern when included normally. However, it must be
* declared for real somewhere. That is done here, by redefining EXTERN as
* the null string, so that inclusion of all *.h files in table.c actually
* generates storage for them.
*
* Various variables could not be declared EXTERN, but are declared PUBLIC
* or PRIVATE. The reason for this is that extern variables cannot have a
* default initialization. If such variables are shared, they must also be
* declared in one of the *.h files without the initialization. Examples
* include 'system_image' (this file) and 'idt' and 'gdt' (protect.c).
*
* Changes:
* Nov 10, 2004 removed controller->driver mappings (Jorrit N. Herder)
* Oct 17, 2004 updated above and tasktab comments (Jorrit N. Herder)
* May 01, 2004 changed struct for system image (Jorrit N. Herder)
*/
#define _TABLE
#include "kernel.h"
#include "proc.h"
#include "ipc.h"
#include <minix/com.h>
#include <ibm/int86.h>
/* Define stack sizes for all tasks included in the system image. */
#define NO_STACK 0
#define SMALL_STACK (128 * sizeof(char *))
#if (CHIP == INTEL) /* 3 intr, 3 temps, 4 db */
#define IDLE_S ((3+3+4) * sizeof(char *))
#else
#define IDLE_S SMALL_STACK
#endif
#define HARDWARE_S NO_STACK /* dummy task, uses kernel stack */
#define SYSTEM_S SMALL_STACK
#define CLOCK_S SMALL_STACK
/* Stack space for all the task stacks. Declared as (char *) to align it. */
#define TOT_STACK_SPACE (IDLE_S + HARDWARE_S + CLOCK_S + SYSTEM_S)
PUBLIC char *t_stack[TOT_STACK_SPACE / sizeof(char *)];
/* The system image table lists all programs that are part of the boot image.
* The order of the entries here MUST agree with the order of the programs
* in the boot image and all kernel tasks must come first.
* Each entry provides the process number, type, scheduling priority, send
* mask, and a name for the process table. For kernel processes, the startup
* routine and stack size is also provided.
*/
#define USER_F (PREEMPTIBLE | BILLABLE)
#define IDLE_F (BILLABLE | SYS_PROC)
#define SYS_F (PREEMPTIBLE | SYS_PROC)
#define TASK_F (SYS_PROC)
#define IDLE_T 32 /* ticks */
#define USER_T 8 /* ticks */
#define SYS_T 16 /* ticks */
PUBLIC struct system_image image[] = {
{ IDLE, idle_task, IDLE_F, IDLE_T, IDLE_Q, IDLE_S, EMPTY_MASK, EMPTY_MASK, "IDLE" },
{ CLOCK, clock_task, TASK_F, SYS_T, TASK_Q, CLOCK_S, FILLED_MASK, SYSTEM_SEND_MASK, "CLOCK" },
{ SYSTEM, sys_task, TASK_F, SYS_T, TASK_Q, SYSTEM_S, FILLED_MASK, SYSTEM_SEND_MASK, "SYSTEM" },
{ HARDWARE, 0, TASK_F, SYS_T, TASK_Q, HARDWARE_S, EMPTY_MASK, SYSTEM_SEND_MASK, "KERNEL" },
{ PM_PROC_NR, 0, SYS_F, SYS_T, 3, 0, FILLED_MASK, SERVER_SEND_MASK, "PM" },
{ FS_PROC_NR, 0, SYS_F, SYS_T, 4, 0, FILLED_MASK, SERVER_SEND_MASK, "FS" },
{ SM_PROC_NR, 0, SYS_F, SYS_T, 3, 0, FILLED_MASK, SYSTEM_SEND_MASK, "SM" },
{ IS_PROC_NR, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, DRIVER_SEND_MASK, "IS" },
{ TTY, 0, SYS_F, SYS_T, 1, 0, FILLED_MASK, SYSTEM_SEND_MASK, "TTY" },
{ MEMORY, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, DRIVER_SEND_MASK, "MEMORY" },
#if ENABLE_AT_WINI
{ AT_WINI, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, DRIVER_SEND_MASK, "AT_WINI" },
#endif
#if ENABLE_FLOPPY
{ FLOPPY, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, DRIVER_SEND_MASK, "FLOPPY" },
#endif
#if ENABLE_PRINTER
{ PRINTER, 0, SYS_F, SYS_T, 3, 0, FILLED_MASK, DRIVER_SEND_MASK, "PRINTER" },
#endif
#if ENABLE_RTL8139
{ RTL8139, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, DRIVER_SEND_MASK, "RTL8139" },
#endif
#if ENABLE_FXP
{ FXP, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, DRIVER_SEND_MASK, "FXP" },
#endif
#if ENABLE_DPETH
{ DPETH, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, DRIVER_SEND_MASK, "DPETH" },
#endif
#if ENABLE_LOG
{ LOG_PROC_NR, 0, SYS_F, SYS_T, 2, 0, FILLED_MASK, SYSTEM_SEND_MASK, "LOG" },
#endif
{ INIT_PROC_NR, 0, USER_F, USER_T, USER_Q, 0, USER_CALL_MASK, USER_SEND_MASK, "INIT" },
};
/* Verify the size of the system image table at compile time. If the number
* is not correct, the size of the 'dummy' array will be negative, causing
* a compile time error. Note that no space is allocated because 'dummy' is
* declared extern.
*/
extern int dummy[(NR_BOOT_PROCS==sizeof(image)/sizeof(struct system_image))?1:-1];