2e89eb5270
any number of kernel calls. Allowed kernel calls are stored in table.c for every image process as a variably-sized array of allowed calls. This is used to fill the bitmap of size determined at compile time by the number of kernel calls. This filling is done by main.c. There is a special call called SYS_ALL_CALLS which fills the bitmap of allowed calls completely, if that is the only entry in the array.
138 lines
6.2 KiB
C
Executable file
138 lines
6.2 KiB
C
Executable file
/* The object file of "table.c" contains most kernel data. Variables that
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* are declared in the *.h files appear with EXTERN in front of them, as in
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*
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* EXTERN int x;
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*
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* Normally EXTERN is defined as extern, so when they are included in another
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* file, no storage is allocated. If EXTERN were not present, but just say,
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*
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* int x;
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*
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* then including this file in several source files would cause 'x' to be
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* declared several times. While some linkers accept this, others do not,
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* so they are declared extern when included normally. However, it must be
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* declared for real somewhere. That is done here, by redefining EXTERN as
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* the null string, so that inclusion of all *.h files in table.c actually
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* generates storage for them.
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*
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* Various variables could not be declared EXTERN, but are declared PUBLIC
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* or PRIVATE. The reason for this is that extern variables cannot have a
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* default initialization. If such variables are shared, they must also be
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* declared in one of the *.h files without the initialization. Examples
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* include 'boot_image' (this file) and 'idt' and 'gdt' (protect.c).
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*
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* Changes:
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* Aug 02, 2005 set privileges and minimal boot image (Jorrit N. Herder)
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* Oct 17, 2004 updated above and tasktab comments (Jorrit N. Herder)
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* May 01, 2004 changed struct for system image (Jorrit N. Herder)
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*/
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#define _TABLE
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#include "kernel.h"
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#include "proc.h"
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#include "ipc.h"
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#include <minix/com.h>
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#include <ibm/int86.h>
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/* Define stack sizes for the kernel tasks included in the system image. */
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#define NO_STACK 0
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#define SMALL_STACK (128 * sizeof(char *))
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#define IDL_S SMALL_STACK /* 3 intr, 3 temps, 4 db for Intel */
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#define HRD_S NO_STACK /* dummy task, uses kernel stack */
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#define TSK_S SMALL_STACK /* system and clock task */
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/* Stack space for all the task stacks. Declared as (char *) to align it. */
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#define TOT_STACK_SPACE (IDL_S + HRD_S + (2 * TSK_S))
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PUBLIC char *t_stack[TOT_STACK_SPACE / sizeof(char *)];
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/* Define flags for the various process types. */
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#define IDL_F (SYS_PROC | PREEMPTIBLE | BILLABLE) /* idle task */
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#define TSK_F (SYS_PROC) /* kernel tasks */
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#define SRV_F (SYS_PROC | PREEMPTIBLE) /* system services */
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#define USR_F (BILLABLE | PREEMPTIBLE) /* user processes */
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/* Define system call traps for the various process types. These call masks
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* determine what system call traps a process is allowed to make.
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*/
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#define TSK_T (1 << RECEIVE) /* clock and system */
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#define SRV_T (~0) /* system services */
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#define USR_T ((1 << SENDREC) | (1 << ECHO)) /* user processes */
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/* Send masks determine to whom processes can send messages or notifications.
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* The values here are used for the processes in the boot image. We rely on
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* the initialization code in main() to match the s_nr_to_id() mapping for the
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* processes in the boot image, so that the send mask that is defined here
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* can be directly copied onto map[0] of the actual send mask. Privilege
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* structure 0 is shared by user processes.
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*/
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#define s(n) (1 << (s_nr_to_id(n)))
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#define NUL_M 0
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#define SRV_M (~0)
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#define SYS_M (~0)
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#define USR_M (s(PM_PROC_NR) | s(FS_PROC_NR) | s(RS_PROC_NR) | s(SYSTEM))
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#define DRV_M (USR_M | s(SYSTEM) | s(CLOCK) | s(DS_PROC_NR) | s(LOG_PROC_NR) | s(TTY_PROC_NR))
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/* Define kernel calls that processes are allowed to make. This is not looking
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* very nice, but we need to define the access rights on a per call basis.
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* Note that the reincarnation server has all bits on, because it should
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* be allowed to distribute rights to services that it starts.
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*
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* Calls are unordered lists, converted by the kernel to bitmasks
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* once at runtime.
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*/
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#define FS_C SYS_KILL, SYS_VIRCOPY, SYS_SAFECOPYFROM, SYS_SAFECOPYTO, \
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SYS_VIRVCOPY, SYS_UMAP, SYS_GETINFO, SYS_EXIT, SYS_TIMES, SYS_SETALARM, \
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SYS_PRIVCTL, SYS_TRACE
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#define DRV_C FS_C, SYS_SEGCTL, SYS_IRQCTL, SYS_INT86, SYS_DEVIO, \
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SYS_SDEVIO, SYS_VDEVIO
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PRIVATE int
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fs_c[] = { FS_C },
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pm_c[] = { SYS_ALL_CALLS },
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rs_c[] = { SYS_ALL_CALLS },
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ds_c[] = { SYS_ALL_CALLS },
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drv_c[] = { DRV_C },
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tty_c[] = { DRV_C, SYS_ABORT, SYS_VM_MAP, SYS_IOPENABLE },
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mem_c[] = { DRV_C, SYS_PHYSCOPY, SYS_PHYSVCOPY, SYS_VM_MAP, SYS_IOPENABLE };
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/* The system image table lists all programs that are part of the boot image.
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* The order of the entries here MUST agree with the order of the programs
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* in the boot image and all kernel tasks must come first.
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*
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* Each entry provides the process number, flags, quantum size, scheduling
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* queue, allowed traps, ipc mask, and a name for the process table. The
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* initial program counter and stack size is also provided for kernel tasks.
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*
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* Note: the quantum size must be positive in all cases!
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*/
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#define c(calls) calls, (sizeof(calls) / sizeof((calls)[0]))
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#define no_c { 0 }, 0
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PUBLIC struct boot_image image[] = {
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/* process nr, pc,flags, qs, queue, stack, traps, ipcto, call, name */
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{IDLE, idle_task,IDL_F, 8, IDLE_Q, IDL_S, 0, 0, no_c,"idle" },
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{CLOCK,clock_task,TSK_F, 8, TASK_Q, TSK_S, TSK_T, 0, no_c,"clock" },
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{SYSTEM, sys_task,TSK_F, 8, TASK_Q, TSK_S, TSK_T, 0, no_c,"system"},
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{HARDWARE, 0,TSK_F, 8, TASK_Q, HRD_S, 0, 0, no_c,"kernel"},
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{PM_PROC_NR, 0,SRV_F, 32, 3, 0, SRV_T, SRV_M, c(pm_c),"pm" },
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{FS_PROC_NR, 0,SRV_F, 32, 4, 0, SRV_T, SRV_M, c(fs_c),"fs" },
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{RS_PROC_NR, 0,SRV_F, 4, 3, 0, SRV_T, SYS_M, c(rs_c),"rs" },
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{DS_PROC_NR, 0,SRV_F, 4, 3, 0, SRV_T, SYS_M, c(ds_c),"ds" },
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{TTY_PROC_NR, 0,SRV_F, 4, 1, 0, SRV_T, SYS_M,c(tty_c),"tty" },
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{MEM_PROC_NR, 0,SRV_F, 4, 2, 0, SRV_T, SYS_M,c(mem_c),"memory"},
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{LOG_PROC_NR, 0,SRV_F, 4, 2, 0, SRV_T, SYS_M,c(drv_c),"log" },
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{INIT_PROC_NR, 0,USR_F, 8, USER_Q, 0, USR_T, USR_M, no_c,"init" },
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};
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/* Verify the size of the system image table at compile time. Also verify that
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* the first chunk of the ipc mask has enough bits to accommodate the processes
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* in the image.
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* If a problem is detected, the size of the 'dummy' array will be negative,
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* causing a compile time error. Note that no space is actually allocated
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* because 'dummy' is declared extern.
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*/
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extern int dummy[(NR_BOOT_PROCS==sizeof(image)/
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sizeof(struct boot_image))?1:-1];
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extern int dummy[(BITCHUNK_BITS > NR_BOOT_PROCS - 1) ? 1 : -1];
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