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188 volume VI os16
Script e sorgenti del kernel 189
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80024 | if (rw == DEV_READ)
80025 | {
80026 | n = mem_read ((addr_t) offset, buffer, size);
80027 | }
80028 | else
80029 | {
80030 | n = mem_write ((addr_t) offset, buffer, size);
80031 | }
80032 | }
80033 | else if (device == DEV_NULL) // DEV_NULL
80034 | {
80035 | n = 0;
80036 | }
80037 | else if (device == DEV_ZERO) // DEV_ZERO
80038 | {
80039 | if (rw == DEV_READ)
80040 | {
80041 | for (n = 0; n < size; n++)
80042 | {
80043 | buffer08[n] = 0;
80044 | }
80045 | }
80046 | else
80047 | {
80048 | n = 0;
80049 | }
80050 | }
80051 | else if (device == DEV_PORT) // DEV_PORT
80052 | {
80053 | if (rw == DEV_READ)
80054 | {
80055 | if (size == 1)
80056 | {
80057 | buffer08[0] = in_8 (offset);
80058 | n = 1;
80059 | }
80060 | else if (size == 2)
80061 | {
80062 | buffer16[0] = in_16 (offset);
80063 | n = 2;
80064 | }
80065 | else
80066 | {
80067 | n = 0;
80068 | }
80069 | }
80070 | else
80071 | {
80072 | if (size == 1)
80073 | {
80074 | out_8 (offset, buffer08[0]);
80075 | }
80076 | else if (size == 2)
80077 | {
80078 | out_16 (offset, buffer16[0]);
80079 | n = 2;
80080 | }
80081 | else
80082 | {
80083 | n = 0;
80084 | }
80085 | }
80086 | }
80087 | else
80088 | {
80089 | errset (ENODEV);
80090 | return (-1);
80091 | }
80092 | return (n);
80093 |}
104.2.5 kernel/devices/dev_tty.c
Si veda la sezione 103.1.5.
90042 | //
90043 | if (device == DEV_CONSOLE)
90044 | {
90045 | device = tty_console ((dev_t) 0);
90046 | //
90047 | // As a last resort, use the first console: ‘DEV_CONSOLE0’.
90048 | //
90049 | if (device == 0 || device == DEV_TTY)
90050 | {
90051 | device = DEV_CONSOLE0;
90052 | }
90053 | }
90054 | //
90055 | // Read or write.
90056 | //
90057 | if (rw == DEV_READ)
90058 | {
90059 | for (n = 0; n < size; n++)
90060 | {
90061 | buffer08[n] = tty_read (device);
90062 | if (buffer08[n] == 0)
90063 | {
90064 | //
90065 | // If the pid is not the kernel, should put the process
90066 | // to sleep, waiting for the key.
90067 | //
90068 | if (pid == 0 || ps == NULL)
90069 | {
90070 | //
90071 | // For the kernel there is no sleep and for an
90072 | // unidentified process, either.
90073 | //
90074 | break;
90075 | }
90076 | //
90077 | // Put the process to sleep.
90078 | //
90079 | ps->status = PROC_SLEEPING;
90080 | ps->ret = 0;
90081 | ps->wakeup_events = WAKEUP_EVENT_TTY;
90082 | ps->wakeup_signal = 0;
90083 | ps->wakeup_timer = 0;
90084 | //
90085 | break;
90086 | }
90087 | //
90088 | // Check for control characters.
90089 | //
90090 | if (buffer08[n] == 0x04) // EOT
90091 | {
90092 | //
90093 | // Return EOF.
90094 | //
90095 | *eof = 1;
90096 | break;
90097 | }
90098 | //
90099 | // At this point, show the character on screen, even if it
90100 | // is not nice. It is necessary to show something, because
90101 | // the tty handling is very poor and the library for line
90102 | // input, calculate cursor position based on the characters
90103 | // received.
90104 | //
90105 | tty_write (device, (int) buffer08[n]);
90106 | }
90107 | }
90108 | else
90109 | {
90110 | for (n = 0; n < size; n++)
90111 | {
90112 | tty_write (device, (int) buffer08[n]);
90113 | }
90114 | }
90115 | return (n);
90116 |}
90001 |#include
90002 |#include
90003 |#include
90004 |#include
90005 |#include
90006 |#include
90007 |#include
90008 |#include
90009 |#include
90010 |#include
90011 |#include
90012 |#include
90013 |//----------------------------------------------------------------------
90014 |ssize_t
90015 |dev_tty (pid_t pid, dev_t device, int rw, off_t offset, void *buffer,
90016 | size_t size, int *eof)
90017 |{
90018 | uint8_t *buffer08 = (uint8_t *) buffer;
90019 | ssize_t n;
90020 | proc_t *ps;
90021 | //
90022 | // Get process. Variable ‘ps’ will be ‘NULL’ if the process ID is
90023 | // not valid.
90024 | //
90025 | ps = proc_reference (pid);
90026 | //
90027 | // Convert ‘DEV_TTY’ with the controlling terminal for the process.
90028 | //
90029 | if (device == DEV_TTY)
90030 | {
90031 | device = ps->device_tty;
90032 | //
90033 | // As a last resort, use the generic ‘DEV_CONSOLE’.
90034 | //
90035 | if (device == 0 || device == DEV_TTY)
90036 | {
90037 | device = DEV_CONSOLE;
90038 | }
90039 | }
90040 | //
90041 | // Convert ‘DEV_CONSOLE’ to the currently active console.
104.3 os16: «kernel/diag.h»
Si veda la sezione 103.2.
100001 |#ifndef _KERNEL_DIAG_H
100002 |#define _KERNEL_DIAG_H 1
100003 |
100004 |#include
100005 |#include
100006 |#include
100007 |#include
100008 |
100009 |//----------------------------------------------------------------------
100010 |uint8_t reverse_8_bit (uint8_t source);
100011 |uint16_t reverse_16_bit (uint16_t source);
100012 |uint32_t reverse_32_bit (uint32_t source);
100013 |
100014 |#define reverse_char(s) ((char) reverse_8_bit ((uint8_t) s))
100015 |#define reverse_short(s) ((short) reverse_16_bit ((uint16_t) s))
100016 |#define reverse_int(s) ((int) reverse_16_bit ((uint16_t) s))
100017 |#define reverse_long(s) ((long) reverse_32_bit ((uint32_t) s))
100018 |#define reverse_long_int(s) ((long int) reverse_32_bit ((uint32_t) s))
100019 |//----------------------------------------------------------------------
100020 |void print_hex_8 (void *data, size_t elements);
100021 |void print_hex_16 (void *data, size_t elements);
100022 |void print_hex_32 (void *data, size_t elements);
100023 |
100024 |#define print_hex_char(d, e) (print_hex_8 (d, e))
100025 |#define print_hex_short(d, e) (print_hex_16 (d, e))
100026 |#define print_hex_int(d, e) (print_hex_16 (d, e))
100027 |#define print_hex_long(d, e) (print_hex_32 (d, e))
100028 |#define print_hex_long_int(d, e) (print_hex_32 (d, e))
100029 |//----------------------------------------------------------------------
100030 |void print_hex_8_reverse (void *data, size_t elements);
100031 |void print_hex_16_reverse (void *data, size_t elements);
100032 |void print_hex_32_reverse (void *data, size_t elements);
100033 |
100034 |#define print_hex_char_reverse(d, e) (print_hex_8_reverse (d, e))
100035 |#define print_hex_short_reverse(d, e) (print_hex_16_reverse (d, e))
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