minix/kernel/table.c
2005-09-30 12:54:59 +00:00

122 lines
6 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 'boot_image' (this file) and 'idt' and 'gdt' (protect.c).
*
* Changes:
* Aug 02, 2005 set privileges and minimal boot image (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 the kernel tasks included in the system image. */
#define NO_STACK 0
#define SMALL_STACK (128 * sizeof(char *))
#define IDL_S SMALL_STACK /* 3 intr, 3 temps, 4 db for Intel */
#define HRD_S NO_STACK /* dummy task, uses kernel stack */
#define TSK_S SMALL_STACK /* system and clock task */
/* Stack space for all the task stacks. Declared as (char *) to align it. */
#define TOT_STACK_SPACE (IDL_S + HRD_S + (2 * TSK_S))
PUBLIC char *t_stack[TOT_STACK_SPACE / sizeof(char *)];
/* Define flags for the various process types. */
#define IDL_F (SYS_PROC | PREEMPTIBLE | BILLABLE) /* idle task */
#define TSK_F (SYS_PROC) /* kernel tasks */
#define SRV_F (SYS_PROC | PREEMPTIBLE) /* system services */
#define USR_F (BILLABLE | PREEMPTIBLE) /* user processes */
/* Define system call traps for the various process types. These call masks
* determine what system call traps a process is allowed to make.
*/
#define TSK_T (1 << RECEIVE) /* clock and system */
#define SRV_T (~0) /* system services */
#define USR_T ((1 << SENDREC) | (1 << ECHO)) /* user processes */
/* Send masks determine to whom processes can send messages or notifications.
* The values here are used for the processes in the boot image. We rely on
* the initialization code in main() to match the s_nr_to_id() mapping for the
* processes in the boot image, so that the send mask that is defined here
* can be directly copied onto map[0] of the actual send mask. Privilege
* structure 0 is shared by user processes.
*/
#define s(n) (1 << s_nr_to_id(n))
#define SRV_M (~0)
#define SYS_M (~0)
#define USR_M (s(PM_PROC_NR) | s(FS_PROC_NR) | s(RS_PROC_NR) | s(SYSTEM))
#define DRV_M (USR_M | s(SYSTEM) | s(CLOCK) | s(LOG_PROC_NR) | s(TTY_PROC_NR))
/* Define kernel calls that processes are allowed to make. This is not looking
* very nice, but we need to define the access rights on a per call basis.
* Note that the system services manager has all bits on, because it should
* be allowed to distribute rights to services that it starts.
*/
#define c(n) (1 << ((n)-KERNEL_CALL))
#define RS_C ~0
#define PM_C ~(c(SYS_DEVIO) | c(SYS_SDEVIO) | c(SYS_VDEVIO) \
| c(SYS_IRQCTL) | c(SYS_INT86))
#define FS_C (c(SYS_KILL) | c(SYS_VIRCOPY) | c(SYS_VIRVCOPY) | c(SYS_UMAP) \
| c(SYS_GETINFO) | c(SYS_EXIT) | c(SYS_TIMES) | c(SYS_SETALARM))
#define DRV_C (FS_C | c(SYS_SEGCTL) | c(SYS_IRQCTL) | c(SYS_INT86) \
| c(SYS_DEVIO) | c(SYS_VDEVIO) | c(SYS_SDEVIO))
#define MEM_C (DRV_C | c(SYS_PHYSCOPY) | c(SYS_PHYSVCOPY) | c(SYS_VM_MAP))
/* 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, flags, quantum size (qs), scheduling
* queue, allowed traps, ipc mask, and a name for the process table. The
* initial program counter and stack size is also provided for kernel tasks.
*/
PUBLIC struct boot_image image[] = {
/* process nr, pc, flags, qs, queue, stack, traps, ipcto, call, name */
{ IDLE, idle_task, IDL_F, 8, IDLE_Q, IDL_S, 0, 0, 0, "IDLE" },
{ CLOCK,clock_task, TSK_F, 64, TASK_Q, TSK_S, TSK_T, 0, 0, "CLOCK" },
{ SYSTEM, sys_task, TSK_F, 64, TASK_Q, TSK_S, TSK_T, 0, 0, "SYSTEM"},
{ HARDWARE, 0, TSK_F, 64, TASK_Q, HRD_S, 0, 0, 0, "KERNEL"},
{ PM_PROC_NR, 0, SRV_F, 32, 3, 0, SRV_T, SRV_M, PM_C, "pm" },
{ FS_PROC_NR, 0, SRV_F, 32, 4, 0, SRV_T, SRV_M, FS_C, "fs" },
{ RS_PROC_NR, 0, SRV_F, 4, 3, 0, SRV_T, SYS_M, RS_C, "rs" },
{ TTY_PROC_NR, 0, SRV_F, 4, 1, 0, SRV_T, SYS_M, DRV_C, "tty" },
{ MEM_PROC_NR, 0, SRV_F, 4, 2, 0, SRV_T, DRV_M, MEM_C, "memory"},
{ LOG_PROC_NR, 0, SRV_F, 4, 2, 0, SRV_T, SYS_M, DRV_C, "log" },
{ DRVR_PROC_NR, 0, SRV_F, 4, 2, 0, SRV_T, SYS_M, DRV_C, "driver"},
{ INIT_PROC_NR, 0, USR_F, 8, USER_Q, 0, USR_T, USR_M, 0, "init" },
};
/* Verify the size of the system image table at compile time. Also verify that
* the first chunk of the ipc mask has enough bits to accommodate the processes
* in the image.
* If a problem is detected, the size of the 'dummy' array will be negative,
* causing a compile time error. Note that no space is actually allocated
* because 'dummy' is declared extern.
*/
extern int dummy[(NR_BOOT_PROCS==sizeof(image)/
sizeof(struct boot_image))?1:-1];
extern int dummy[(BITCHUNK_BITS > NR_BOOT_PROCS - 1) ? 1 : -1];