| 0,0 → 1,293 |
|---|
| /* |
| * Copyright (c) 2003 Josef Cejka |
| * Copyright (c) 2005 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup genericconsole |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <console/console.h> |
| #include <console/chardev.h> |
| #include <sysinfo/sysinfo.h> |
| #include <synch/waitq.h> |
| #include <synch/spinlock.h> |
| #include <arch/types.h> |
| #include <ddi/device.h> |
| #include <ddi/irq.h> |
| #include <ddi/ddi.h> |
| #include <ipc/irq.h> |
| #include <arch.h> |
| #include <func.h> |
| #include <print.h> |
| #include <atomic.h> |
| |
| #define KLOG_SIZE PAGE_SIZE |
| #define KLOG_LATENCY 8 |
| |
| /**< Kernel log cyclic buffer */ |
| static char klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE))); |
| |
| /**< Kernel log initialized */ |
| static bool klog_inited = false; |
| /**< First kernel log characters */ |
| static index_t klog_start = 0; |
| /**< Number of valid kernel log characters */ |
| static size_t klog_len = 0; |
| /**< Number of stored (not printed) kernel log characters */ |
| static size_t klog_stored = 0; |
| /**< Number of stored kernel log characters for uspace */ |
| static size_t klog_uspace = 0; |
| |
| /**< Kernel log spinlock */ |
| SPINLOCK_INITIALIZE(klog_lock); |
| |
| /** Physical memory area used for klog buffer */ |
| static parea_t klog_parea; |
| |
| /* |
| * For now, we use 0 as INR. |
| * However, it is therefore desirable to have architecture specific |
| * definition of KLOG_VIRT_INR in the future. |
| */ |
| #define KLOG_VIRT_INR 0 |
| |
| static irq_t klog_irq; |
| |
| static chardev_operations_t null_stdout_ops = { |
| .suspend = NULL, |
| .resume = NULL, |
| .write = NULL, |
| .read = NULL |
| }; |
| |
| chardev_t null_stdout = { |
| .name = "null", |
| .op = &null_stdout_ops |
| }; |
| |
| /** Allways refuse IRQ ownership. |
| * |
| * This is not a real IRQ, so we always decline. |
| * |
| * @return Always returns IRQ_DECLINE. |
| */ |
| static irq_ownership_t klog_claim(void) |
| { |
| return IRQ_DECLINE; |
| } |
| |
| /** Standard input character device */ |
| chardev_t *stdin = NULL; |
| chardev_t *stdout = &null_stdout; |
| |
| /** Initialize kernel logging facility |
| * |
| * The shared area contains kernel cyclic buffer. Userspace application may |
| * be notified on new data with indication of position and size |
| * of the data within the circular buffer. |
| */ |
| void klog_init(void) |
| { |
| void *faddr = (void *) KA2PA(klog); |
| |
| ASSERT((uintptr_t) faddr % FRAME_SIZE == 0); |
| ASSERT(KLOG_SIZE % FRAME_SIZE == 0); |
| |
| devno_t devno = device_assign_devno(); |
| |
| klog_parea.pbase = (uintptr_t) faddr; |
| klog_parea.vbase = (uintptr_t) klog; |
| klog_parea.frames = SIZE2FRAMES(KLOG_SIZE); |
| klog_parea.cacheable = true; |
| ddi_parea_register(&klog_parea); |
| |
| sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr); |
| sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE)); |
| sysinfo_set_item_val("klog.devno", NULL, devno); |
| sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR); |
| |
| irq_initialize(&klog_irq); |
| klog_irq.devno = devno; |
| klog_irq.inr = KLOG_VIRT_INR; |
| klog_irq.claim = klog_claim; |
| irq_register(&klog_irq); |
| |
| spinlock_lock(&klog_lock); |
| klog_inited = true; |
| spinlock_unlock(&klog_lock); |
| } |
| |
| /** Get character from character device. Do not echo character. |
| * |
| * @param chardev Character device. |
| * |
| * @return Character read. |
| */ |
| uint8_t _getc(chardev_t *chardev) |
| { |
| uint8_t ch; |
| ipl_t ipl; |
| |
| if (atomic_get(&haltstate)) { |
| /* If we are here, we are hopefully on the processor, that |
| * issued the 'halt' command, so proceed to read the character |
| * directly from input |
| */ |
| if (chardev->op->read) |
| return chardev->op->read(chardev); |
| /* no other way of interacting with user, halt */ |
| if (CPU) |
| printf("cpu%u: ", CPU->id); |
| else |
| printf("cpu: "); |
| printf("halted - no kconsole\n"); |
| cpu_halt(); |
| } |
| |
| waitq_sleep(&chardev->wq); |
| ipl = interrupts_disable(); |
| spinlock_lock(&chardev->lock); |
| ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
| chardev->counter--; |
| spinlock_unlock(&chardev->lock); |
| interrupts_restore(ipl); |
| |
| chardev->op->resume(chardev); |
| |
| return ch; |
| } |
| |
| /** Get string from character device. |
| * |
| * Read characters from character device until first occurrence |
| * of newline character. |
| * |
| * @param chardev Character device. |
| * @param buf Buffer where to store string terminated by '\0'. |
| * @param buflen Size of the buffer. |
| * |
| * @return Number of characters read. |
| */ |
| count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
| { |
| index_t index = 0; |
| char ch; |
| |
| while (index < buflen) { |
| ch = _getc(chardev); |
| if (ch == '\b') { |
| if (index > 0) { |
| index--; |
| /* Space backspace, space */ |
| putchar('\b'); |
| putchar(' '); |
| putchar('\b'); |
| } |
| continue; |
| } |
| putchar(ch); |
| |
| if (ch == '\n') { /* end of string => write 0, return */ |
| buf[index] = '\0'; |
| return (count_t) index; |
| } |
| buf[index++] = ch; |
| } |
| return (count_t) index; |
| } |
| |
| /** Get character from device & echo it to screen */ |
| uint8_t getc(chardev_t *chardev) |
| { |
| uint8_t ch; |
| |
| ch = _getc(chardev); |
| putchar(ch); |
| return ch; |
| } |
| |
| void klog_update(void) |
| { |
| spinlock_lock(&klog_lock); |
| |
| if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) { |
| ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace); |
| klog_uspace = 0; |
| } |
| |
| spinlock_unlock(&klog_lock); |
| } |
| |
| void putchar(char c) |
| { |
| spinlock_lock(&klog_lock); |
| |
| if ((klog_stored > 0) && (stdout->op->write)) { |
| /* Print charaters stored in kernel log */ |
| index_t i; |
| for (i = klog_len - klog_stored; i < klog_len; i++) |
| stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE]); |
| klog_stored = 0; |
| } |
| |
| /* Store character in the cyclic kernel log */ |
| klog[(klog_start + klog_len) % KLOG_SIZE] = c; |
| if (klog_len < KLOG_SIZE) |
| klog_len++; |
| else |
| klog_start = (klog_start + 1) % KLOG_SIZE; |
| |
| if (stdout->op->write) |
| stdout->op->write(stdout, c); |
| else { |
| /* The character is just in the kernel log */ |
| if (klog_stored < klog_len) |
| klog_stored++; |
| } |
| |
| /* The character is stored for uspace */ |
| if (klog_uspace < klog_len) |
| klog_uspace++; |
| |
| /* Check notify uspace to update */ |
| bool update; |
| if ((klog_uspace > KLOG_LATENCY) || (c == '\n')) |
| update = true; |
| else |
| update = false; |
| |
| spinlock_unlock(&klog_lock); |
| |
| if (update) |
| klog_update(); |
| } |
| |
| /** @} |
| */ |