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266 volume VI os16
Script e sorgenti del kernel 267
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1640016 | }
1640017 | ram_copy (seg_d (), (unsigned int) buffer, segment, offset, size);
1640018 | return (size);
1640019 |}
104.9 os16: «kernel/proc.h»
Si veda la sezione 103.8.
1650001 |#ifndef _KERNEL_PROC_H
1650002 |#define _KERNEL_PROC_H 1
1650003 |
1650004 |#include
1650005 |#include
1650006 |#include
1650007 |#include
1650008 |#include
1650009 |#include
1650010 |#include
1650011 |#include
1650012 |#include
1650013 |#include
1650014 |
1650015 |//----------------------------------------------------------------------
1650016 |#define CLOCK_FREQUENCY_DIVISOR 65535 // [1]
1650017 |//
1650018 |// [1]
1650019 |// Internal clock frequency is (3579545/3) Hz.
1650020 |// This value is divided by 65535 (0xFFFF) giving 18.2 Hz.
1650021 |// The divisor value, 65535, if fixed!
1650022 |//
1650023 |//----------------------------------------------------------------------
1650024 |#define PROC_EMPTY 0
1650025 |#define PROC_CREATED 1
1650026 |#define PROC_READY 2
1650027 |#define PROC_RUNNING 3
1650028 |#define PROC_SLEEPING 4
1650029 |#define PROC_ZOMBIE 5
1650030 |//----------------------------------------------------------------------
1650031 |#define MAGIC_OS16 0x6F733136L // os16
1650032 |#define MAGIC_OS16_APPL 0x6170706CL // appl
1650033 |#define MAGIC_OS16_KERN 0x6B65726EL // kern
1650034 |//----------------------------------------------------------------------
1650035 |#define PROCESS_MAX 16 // Process slots.
1650036 |
1650037 |typedef struct {
1650038 | pid_t ppid; // Parent PID.
1650039 | pid_t pgrp; // Process group ID.
1650040 | uid_t uid; // Real user ID
1650041 | uid_t euid; // Effective user ID.
1650042 | uid_t suid; // Saved user ID.
1650043 | dev_t device_tty; // Controlling terminal.
1650044 | char path_cwd[PATH_MAX];
1650045 | // Working directory path.
1650046 | inode_t *inode_cwd; // Working directory inode.
1650047 | int umask; // File creation mask.
1650048 | unsigned long int sig_status; // Active signals.
1650049 | unsigned long int sig_ignore; // Signals to be ignored.
1650050 | clock_t usage; // Clock ticks CPU time usage.
1650051 | unsigned int status;
1650052 | int wakeup_events; // Wake up for something.
1650053 | int wakeup_signal; // Signal waited.
1650054 | unsigned int wakeup_timer; // Seconds to wait for.
1650055 | addr_t address_i;
1650056 | segment_t segment_i;
1650057 | size_t size_i;
1650058 | addr_t address_d;
1650059 | segment_t segment_d;
1650060 | size_t size_d;
1650061 | uint16_t sp;
1650062 | int ret;
1650063 | char name[PATH_MAX];
1650064 | fd_t fd[FOPEN_MAX];
1650065 |} proc_t;
1650066 |
1650067 |extern proc_t proc_table[PROCESS_MAX];
1650068 |//----------------------------------------------------------------------
1650069 |typedef struct {
1650070 | uint32_t filler0;
1650071 | uint32_t magic0;
1650072 | uint32_t magic1;
1650073 | uint16_t segoff;
1650074 | uint16_t etext;
1650075 | uint16_t edata;
1650076 | uint16_t ebss;
1650077 | uint16_t ssize;
1650078 |} header_t;
1650079 |//----------------------------------------------------------------------
1650080 |void _ivt_load (void);
1650081 |#define ivt_load() (_ivt_load ())
1650082 |void proc_init (void);
1650083 |void proc_scheduler (uint16_t *sp, segment_t *segment);
1650084 |void sysroutine (uint16_t *sp, segment_t *segment,
1650085 | uint16_t syscallnr, uint16_t msg_off,
1650086 | uint16_t msg_size);
1650087 |proc_t *proc_reference (pid_t pid);
1650088 |//----------------------------------------------------------------------
1650089 |int proc_sys_exec (uint16_t *sp, segment_t *segment_d,
1650090 | pid_t pid, const char *path,
1650091 | unsigned int argc, char *arg_data,
1650092 | unsigned int envc, char *env_data);
1650093 |void proc_sys_exit (pid_t pid, int status);
1650094 |pid_t proc_sys_fork (pid_t ppid, uint16_t sp);
1650095 |int proc_sys_kill (pid_t pid_killer, pid_t pid_target,
1650096 | int sig);
1650097 |int proc_sys_seteuid (pid_t pid, uid_t euid);
1650098 |int proc_sys_setuid (pid_t pid, uid_t uid);
1650099 |sighandler_t proc_sys_signal (pid_t pid, int sig,
1650100 | sighandler_t handler);
1650101 |pid_t proc_sys_wait (pid_t pid, int *status);
1650102 |//----------------------------------------------------------------------
1650103 |void proc_dump_memory (pid_t pid, addr_t address,
1650104 | size_t size, char *name);
1650105 |void proc_available (pid_t pid);
1650106 |pid_t proc_find (segment_t segment_d);
1650107 |void proc_sch_signals (void);
1650108 |void proc_sch_terminals (void);
1650109 |void proc_sch_timers (void);
1650110 |void proc_sig_chld (pid_t parent, int sig);
1650111 |void proc_sig_cont (pid_t pid, int sig);
1650112 |void proc_sig_core (pid_t pid, int sig);
1650113 |int proc_sig_ignore (pid_t pid, int sig);
1650114 |void proc_sig_off (pid_t pid, int sig);
1650115 |void proc_sig_on (pid_t pid, int sig);
1650116 |int proc_sig_status (pid_t pid, int sig);
1650117 |void proc_sig_stop (pid_t pid, int sig);
1650118 |void proc_sig_term (pid_t pid, int sig);
1650119 |
1650120 |#endif
104.9.1 kernel/proc/_isr.s
Si veda la sezione 103.8.1.
1660001 |.extern _proc_scheduler
1660002 |.extern _sysroutine
1660003 |.global __ksp
1660004 |.global __clock_ticks
1660005 |.global __clock_seconds
1660006 |.global isr_1C
1660007 |.global isr_80
1660008 |;-----------------------------------------------------------------------
1660009 |; The kernel code segment starts at 0x10500 (segment 0x1050).
1660010 |; The kernel data segments start at 0x00500 (segment 0x0050).
1660011 |; To switch to the kernel data segments, DS, ES and SS are set to
1660012 |; 0x0050. To identify the kernel context, the DS register is checked:
1660013 |; if it is equal to 0x0050, it is the kernel.
1660014 |;-----------------------------------------------------------------------
1660015 |.data
1660016 |;-----------------------------------------------------------------------
1660017 |.align 2
1660018 |proc_ss_0: .word 0x0000
1660019 |proc_sp_0: .word 0x0000
1660020 |proc_ss_1: .word 0x0000
1660021 |proc_sp_1: .word 0x0000
1660022 |proc_syscallnr: .word 0x0000
1660023 |proc_msg_offset: .word 0x0000
1660024 |proc_msg_size: .word 0x0000
1660025 |__ksp: .word 0x0000
1660026 |__clock_ticks:
1660027 |ticks_lo: .word 0x0000
1660028 |ticks_hi: .word 0x0000
1660029 |__clock_seconds:
1660030 |seconds_lo: .word 0x0000
1660031 |seconds_hi: .word 0x0000
1660032 |;-----------------------------------------------------------------------
1660033 |.text
1660034 |;-----------------------------------------------------------------------
1660035 |; IRQ 0: "timer".
1660036 |; IRQ 0 is associated to INT 8, and after the BIOS work is done,
1660037 |; INT 1C is called. Standard INT 1C has nothing to do, but is
1660038 |; useful to call extra work for the timer. As the original BIOS
1660039 |; interrupts are used, the INT 1C is reprogrammed, keeping intact
1660040 |; the Standard INT 8.
1660041 |;-----------------------------------------------------------------------
1660042 |.align 2
1660043 |isr_1C:
1660044 | ;-------------------------------------------------------------------
1660045 | ; Inside the process stack, the CPU already put:
1660046 | ;
1660047 | ; [omissis]
1660048 | ; push flags
1660049 | ; push cs
1660050 | ; push ip
1660051 | ;-------------------------------------------------------------------
1660052 | ;
1660053 | ; Save into process stack:
1660054 | ;
1660055 | push es ; extra segment
1660056 | push ds ; data segment
1660057 | push di ; destination index
1660058 | push si ; source index
1660059 | push bp ; base pointer
1660060 | push bx ; BX
1660061 | push dx ; DX
1660062 | push cx ; CX
1660063 | push ax ; AX
1660064 | ;
1660065 | ; Set the data segments to the kernel data area,
1660066 | ; so that the following variables can be accessed.
1660067 | ;
1660068 | mov ax, #0x0050 ; DS and ES.
1660069 | mov ds, ax ;
1660070 | mov es, ax ;
1660071 | ;
1660072 | ; Increment time counters, to keep time.
1660073 | ;
1660074 | add ticks_lo, #1 ; Clock ticks counter.
1660075 | adc ticks_hi, #0 ;
1660076 | ;
1660077 | mov dx, ticks_hi ;
1660078 | mov ax, ticks_lo ; DX := ticks % 18
1660079 | mov cx, #18 ;
1660080 | div cx ;
1660081 | mov ax, #0 ; If the ticks value can be divided by 18,
1660082 | cmp ax, dx ; the seconds is incremented by 1.
1660083 | jnz L1 ;
1660084 | add seconds_lo, #1 ;
1660085 | adc seconds_hi, #0 ;
1660086 | ;
1660087 |L1: ; Save process stack registers into kernel data segment.
1660088 | ;
1660089 | mov proc_ss_0, ss ; Save process stack segment.
1660090 | mov proc_sp_0, sp ; Save process stack pointer.
1660091 | ;
1660092 | ; Check if it is already in kernel mode.
1660093 | ;
1660094 | mov dx, proc_ss_0
1660095 | mov ax, #0x0050 ; Kernel data area.
1660096 | cmp dx, ax
1660097 | je L2
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