minix/kernel/table.c

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/* 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 'tasktab' (this file) and 'idt'/'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)
* Aug 18, 2004 included p_type in tasktab (Jorrit N. Herder)
* May 01, 2004 included p_sendmask in tasktab (Jorrit N. Herder)
*/
#define _TABLE
#include "kernel.h"
#include "proc.h"
#include "sendmask.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)
#define IDLE_STACK ((3+3+4) * sizeof(char *)) /* 3 intr, 3 temps, 4 db */
#else
#define IDLE_STACK SMALL_STACK
#endif
#define HARDWARE_STACK NO_STACK /* dummy task, uses kernel stack */
#define SYS_STACK SMALL_STACK
#define CLOCK_STACK SMALL_STACK
#define RTL8139_STACK (2 * SMALL_STACK * ENABLE_RTL8139)
/* Stack space for all the task stacks. Declared as (char *) to align it. */
#define TOT_STACK_SPACE (IDLE_STACK + HARDWARE_STACK + CLOCK_STACK + SYS_STACK \
+ RTL8139_STACK )
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.
*/
PUBLIC struct system_image image[] = {
#if ENABLE_RTL8139
{ RTL8139, rtl8139_task, P_TASK, PPRI_TASK, RTL8139_STACK, RTL8139_SENDMASK, "RTL8139" },
#endif
{ IDLE, idle_task, P_IDLE, PPRI_IDLE, IDLE_STACK, IDLE_SENDMASK, "IDLE" },
{ CLOCK, clock_task, P_TASK, PPRI_TASK, CLOCK_STACK, CLOCK_SENDMASK, "CLOCK" },
{ SYSTASK, sys_task, P_TASK, PPRI_TASK, SYS_STACK, SYSTEM_SENDMASK, "SYS" },
{ HARDWARE, 0, P_TASK, PPRI_TASK, HARDWARE_STACK,HARDWARE_SENDMASK,"HARDWAR" },
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{ PM_PROC_NR, 0, P_SERVER, PPRI_NORMAL, 0, PM_SENDMASK, "PM" },
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{ FS_PROC_NR, 0, P_SERVER, PPRI_NORMAL, 0, FS_SENDMASK, "FS" },
{ IS_PROC_NR, 0, P_SYSTEM, PPRI_HIGHER, 0, IS_SENDMASK, "IS" },
{ TTY, 0, P_SYSTEM, PPRI_HIGHER, 0, TTY_SENDMASK, "TTY" },
{ MEMORY, 0, P_DRIVER, PPRI_HIGH, 0, MEM_SENDMASK, "MEMORY" },
#if ENABLE_AT_WINI
{ AT_WINI, 0, P_DRIVER, PPRI_HIGHER, 0, AT_SENDMASK, "AT_WINI" },
#endif
#if ENABLE_FLOPPY
{ FLOPPY, 0, P_DRIVER, PPRI_HIGH, 0, FLOPPY_SENDMASK, "FLOPPY" },
#endif
#if ENABLE_PRINTER
{ PRINTER, 0, P_DRIVER, PPRI_NORMAL, 0, PRN_SENDMASK, "PRINTER" },
#endif
{ INIT_PROC_NR, 0, P_USER, PPRI_USER, 0, INIT_SENDMASK, "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[(IMAGE_SIZE==sizeof(image)/sizeof(struct system_image))?1:-1];