redesign of the IO interface
- all messages are stored in a ring buffer - new devices (e.g. UART) are able to print previous messages
This commit is contained in:
parent
7a15541d82
commit
4a9440dd62
6 changed files with 129 additions and 55 deletions
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@ -60,12 +60,6 @@ int uart_puts(const char *text);
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*/
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int uart_putchar(unsigned char c);
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/** @brief Start thread to handle inputs on the serial device
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*
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* @return error code of create_kernel_thread
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*/
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int uart_enable_input(void);
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#ifdef __cplusplus
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}
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#endif
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@ -29,6 +29,7 @@
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#include <eduos/string.h>
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#include <eduos/mailbox.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <asm/uart.h>
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#include <asm/irq.h>
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#include <asm/irqflags.h>
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@ -79,23 +80,32 @@
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#define UART_LCR_STOP 0x04 /* Stop bits: 0=1 bit, 1=2 bits */
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#define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */
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static uint8_t mmio = 0;
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static uint32_t iobase = 0;
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static tid_t id;
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static mailbox_uint8_t input_queue;
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#define MEMMAPIO
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#if 1
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#define READ_FROM_UART(x) inportb(iobase + x)
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#define WRITE_TO_UART(x, y) outportb(iobase + x, y)
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#else
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#define READ_FROM_UART(x) inportb(iobase + x)
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#define WRITE_TO_UART(x, y) outportb(iobase + x, y)
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#endif
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static inline unsigned char read_from_uart(uint32_t off)
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{
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if (mmio)
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return *((volatile unsigned char*) (iobase + off));
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else
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return inportb(iobase + off);
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}
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static void write_to_uart(uint32_t off, unsigned char c)
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{
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if (mmio)
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*((volatile unsigned char*) (iobase + off)) = c;
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else
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outportb(iobase + off, c);
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}
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/* Get a single character on a serial device */
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static unsigned char uart_getchar(void)
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{
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return READ_FROM_UART(UART_RX);
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return read_from_uart(UART_RX);
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}
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/* Puts a single character on a serial device */
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@ -104,7 +114,7 @@ int uart_putchar(unsigned char c)
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if (!iobase)
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return 0;
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WRITE_TO_UART(UART_TX, c);
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write_to_uart(UART_TX, c);
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return (int) c;
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}
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@ -126,7 +136,7 @@ int uart_puts(const char *text)
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/* Handles all UART's interrupt */
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static void uart_handler(struct state *s)
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{
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unsigned char c = READ_FROM_UART(UART_IIR);
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unsigned char c = read_from_uart(UART_IIR);
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while (!(c & UART_IIR_NO_INT)) {
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if (c & UART_IIR_RDI) {
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@ -135,7 +145,7 @@ static void uart_handler(struct state *s)
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mailbox_uint8_post(&input_queue, c);
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}
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c = READ_FROM_UART(UART_IIR);
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c = read_from_uart(UART_IIR);
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}
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}
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@ -153,18 +163,6 @@ static int uart_thread(void* arg)
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return 0;
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}
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int uart_enable_input(void)
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{
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int err = create_kernel_task(&id, uart_thread, NULL, HIGH_PRIO);
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if (BUILTIN_EXPECT(err, 0))
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kprintf("Failed to create task (uart): %d\n", err);
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else
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kputs("Create task to handle incoming messages (uart)\n");
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return err;
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}
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static void uart_config(void)
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{
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mailbox_uint8_init(&input_queue);
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@ -174,7 +172,7 @@ static void uart_config(void)
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* clear RX and TX FIFO
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* set irq trigger to 8 bytes
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*/
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WRITE_TO_UART(UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_1);
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write_to_uart(UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_1);
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/*
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* 8bit word length
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@ -183,19 +181,25 @@ static void uart_config(void)
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* set DLAB=1
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*/
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char lcr = UART_LCR_WLEN8 | UART_LCR_DLAB;
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WRITE_TO_UART(UART_LCR, lcr);
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write_to_uart(UART_LCR, lcr);
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/*
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* set baudrate to 115200 (on qemu)
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*/
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WRITE_TO_UART(UART_DLL, 0x01);
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WRITE_TO_UART(UART_DLM, 0x00);
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write_to_uart(UART_DLL, 0x01);
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write_to_uart(UART_DLM, 0x00);
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/* set DLAB=0 */
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WRITE_TO_UART(UART_LCR, lcr & (~UART_LCR_DLAB));
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write_to_uart(UART_LCR, lcr & (~UART_LCR_DLAB));
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/* enable interrupt */
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WRITE_TO_UART(UART_IER, UART_IER_RDI | UART_IER_RLSI | UART_IER_THRI);
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write_to_uart(UART_IER, UART_IER_RDI | UART_IER_RLSI | UART_IER_THRI);
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int err = create_kernel_task(&id, uart_thread, NULL, HIGH_PRIO);
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if (BUILTIN_EXPECT(err, 0))
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kprintf("Failed to create task for the uart device: %d\n", err);
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koutput_add_uart();
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}
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int uart_init(void)
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@ -213,12 +217,25 @@ int uart_init(void)
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return -1;
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Lsuccess:
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// we use COM1
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iobase = 0x03f8;
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irq_install_handler(32+4, uart_handler);
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if (pci_info.type[0]) {
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// we use COM1
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mmio = 0;
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iobase = 0x3F8;
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irq_install_handler(32+4, uart_handler);
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} else {
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mmio = 1;
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iobase = pci_info.base[0];
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irq_install_handler(32+pci_info.irq, uart_handler);
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page_map(iobase & PAGE_MASK, iobase & PAGE_MASK, 1, PG_GLOBAL | PG_RW | PG_PCD);
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}
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// configure uart
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uart_config();
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#else
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// we use COM1
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mmio = 0;
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iobase = 0x3F8;
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irq_install_handler(32+4, uart_handler);
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#endif
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return 0;
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@ -40,6 +40,7 @@ extern "C" {
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#define CACHE_LINE 64
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#define KERNEL_STACK_SIZE (8<<10) /* 8 KiB */
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#define BITMAP_SIZE (128<<5) /* for 128 MiB of RAM */
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#define KMSG_SIZE (8*1024)
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#define INT_SYSCALL 0x80
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#define MAILBOX_SIZE 32
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@ -77,6 +77,11 @@ int ksnprintf(char *str, size_t size, const char *format, ...);
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*/
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int kvprintf(char const *fmt, void (*func) (int, void *), void *arg, int radix, va_list ap);
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/**
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* Add UART device to dump kernel messages
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*/
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int koutput_add_uart(void);
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#ifdef __cplusplus
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}
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#endif
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@ -117,14 +117,14 @@ static int eduos_init(void)
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// initialize .bss section
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memset((void*)&bss_start, 0x00, ((size_t) &bss_end - (size_t) &bss_start));
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koutput_init();
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system_init();
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irq_init();
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timer_init();
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koutput_init();
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multitasking_init();
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memory_init();
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#ifdef CONFIG_UART
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uart_enable_input();
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uart_init();
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#endif
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return 0;
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@ -29,16 +29,30 @@
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#include <eduos/string.h>
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#include <eduos/stdarg.h>
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#include <eduos/spinlock.h>
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#include <asm/uart.h>
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#include <asm/atomic.h>
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#include <asm/processor.h>
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#ifdef CONFIG_VGA
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#include <asm/vga.h>
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#endif
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#ifdef CONFIG_UART
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#include <asm/uart.h>
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#endif
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#define NO_EARLY_PRINT 0x00
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#define VGA_EARLY_PRINT 0x01
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#define UART_EARLY_PRINT 0x02
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#ifdef CONFIG_VGA
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static uint32_t early_print = VGA_EARLY_PRINT;
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#else
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static uint32_t early_print = NO_EARLY_PRINT;
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#endif
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static spinlock_irqsave_t olock = SPINLOCK_IRQSAVE_INIT;
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static atomic_int32_t kmsg_counter = ATOMIC_INIT(0);
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static unsigned char kmessages[KMSG_SIZE] __attribute__ ((section(".kmsg"))) = {[0 ... KMSG_SIZE-1] = 0x00};
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int koutput_init(void)
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{
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#ifdef CONFIG_UART
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uart_init();
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#endif
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#ifdef CONFIG_VGA
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vga_init();
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#endif
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@ -48,24 +62,67 @@ int koutput_init(void)
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int kputchar(int c)
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{
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spinlock_irqsave_lock(&olock);
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#ifdef CONFIG_UART
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uart_putchar(c);
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#endif
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int pos;
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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_lock(&olock);
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pos = atomic_int32_inc(&kmsg_counter);
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kmessages[pos % KMSG_SIZE] = (unsigned char) c;
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#ifdef CONFIG_VGA
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vga_putchar(c);
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if (early_print & VGA_EARLY_PRINT)
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vga_putchar(c);
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#endif
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spinlock_irqsave_unlock(&olock);
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#ifdef CONFIG_UART
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if (early_print & UART_EARLY_PRINT)
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uart_putchar(c);
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#endif
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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_unlock(&olock);
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return 1;
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}
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int kputs(const char *str)
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{
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int i;
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int pos, i, len = strlen(str);
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for(i=0; str[i] != '\0'; i++)
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kputchar((int) str[i]);
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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_lock(&olock);
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return i;
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for(i=0; i<len; i++) {
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pos = atomic_int32_inc(&kmsg_counter);
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kmessages[pos % KMSG_SIZE] = str[i];
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#ifdef CONFIG_VGA
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if (early_print & VGA_EARLY_PRINT)
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vga_putchar(str[i]);
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#endif
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#ifdef CONFIG_UART
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if (early_print & UART_EARLY_PRINT)
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uart_putchar(str[i]);
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#endif
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}
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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_unlock(&olock);
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return len;
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}
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int koutput_add_uart(void)
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{
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#ifdef CONFIG_UART
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uint32_t i;
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early_print |= UART_EARLY_PRINT;
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for(i=0; i<atomic_int32_read(&kmsg_counter); i++)
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uart_putchar(kmessages[i % KMSG_SIZE]);
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return 0;
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#else
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return -EINVAL;
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#endif
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}
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