diff options
Diffstat (limited to 'com32/sysdump/serial.c')
| -rw-r--r-- | com32/sysdump/serial.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/com32/sysdump/serial.c b/com32/sysdump/serial.c deleted file mode 100644 index a3987531..00000000 --- a/com32/sysdump/serial.c +++ /dev/null @@ -1,169 +0,0 @@ -#include <stdbool.h> -#include <stdlib.h> -#include <stdio.h> -#include <console.h> -#include <sys/io.h> -#include <sys/cpu.h> -#include <syslinux/config.h> - -#include "serial.h" - -enum { - THR = 0, - RBR = 0, - DLL = 0, - DLM = 1, - IER = 1, - IIR = 2, - FCR = 2, - LCR = 3, - MCR = 4, - LSR = 5, - MSR = 6, - SCR = 7, -}; - - -int serial_init(struct serial_if *sif, const char *argv[]) -{ - const struct syslinux_serial_console_info *sci - = syslinux_serial_console_info(); - uint16_t port; - unsigned int divisor; - uint8_t dll, dlm, lcr; - - if (!argv[0]) { - if (sci->iobase) { - port = sci->iobase; - } else { - printf("No port number specified and not using serial console!\n"); - return -1; - } - } else { - port = strtoul(argv[0], NULL, 0); - if (port <= 3) { - uint16_t addr = ((uint16_t *)0x400)[port]; - if (!addr) { - printf("No serial port address found!\n"); - return -1; - } - printf("Serial port %u is at 0x%04x\n", port, addr); - port = addr; - } - } - - sif->port = port; - sif->console = false; - - divisor = 1; /* Default speed = 115200 bps */ - - /* Check to see if this is the same as the serial console */ - if (port == sci->iobase) { - /* Overlaying the console... */ - sif->console = true; - - /* Default to already configured speed */ - divisor = sci->divisor; - - /* Shut down I/O to the console for the time being */ - openconsole(&dev_null_r, &dev_null_w); - } - - if (argv[0] && argv[1]) - divisor = 115200/strtoul(argv[1], NULL, 0); - - cli(); /* Just in case... */ - - /* Save old register settings */ - sif->old.lcr = inb(port + LCR); - sif->old.mcr = inb(port + MCR); - sif->old.iir = inb(port + IIR); - - /* Set speed */ - outb(0x83, port + LCR); /* Enable divisor access */ - sif->old.dll = inb(port + DLL); - sif->old.dlm = inb(port + DLM); - outb(divisor, port + DLL); - outb(divisor >> 8, port + DLM); - (void)inb(port + IER); /* Synchronize */ - - dll = inb(port + DLL); - dlm = inb(port + DLM); - lcr = inb(port + LCR); - outb(0x03, port + LCR); /* Enable data access, n81 */ - (void)inb(port + IER); /* Synchronize */ - sif->old.ier = inb(port + IER); - - /* Disable interrupts */ - outb(0, port + IER); - - sti(); - - if (dll != (uint8_t)divisor || - dlm != (uint8_t)(divisor >> 8) || - lcr != 0x83) { - serial_cleanup(sif); - printf("No serial port detected!\n"); - return -1; /* This doesn't look like a serial port */ - } - - /* Enable 16550A FIFOs if available */ - outb(0x01, port + FCR); /* Enable FIFO */ - (void)inb(port + IER); /* Synchronize */ - if (inb(port + IIR) < 0xc0) - outb(0x00, port + FCR); /* Disable FIFOs if non-functional */ - (void)inb(port + IER); /* Synchronize */ - - return 0; -} - -void serial_write(struct serial_if *sif, const void *data, size_t n) -{ - uint16_t port = sif->port; - const char *p = data; - uint8_t lsr; - - while (n--) { - do { - lsr = inb(port + LSR); - } while (!(lsr & 0x20)); - - outb(*p++, port + THR); - } -} - -void serial_read(struct serial_if *sif, void *data, size_t n) -{ - uint16_t port = sif->port; - char *p = data; - uint8_t lsr; - - while (n--) { - do { - lsr = inb(port + LSR); - } while (!(lsr & 0x01)); - - *p++ = inb(port + RBR); - } -} - -void serial_cleanup(struct serial_if *sif) -{ - uint16_t port = sif->port; - - outb(0x83, port + LCR); - (void)inb(port + IER); - outb(sif->old.dll, port + DLL); - outb(sif->old.dlm, port + DLM); - (void)inb(port + IER); - outb(sif->old.lcr & 0x7f, port + LCR); - (void)inb(port + IER); - outb(sif->old.mcr, port + MCR); - outb(sif->old.ier, port + IER); - if (sif->old.iir < 0xc0) - outb(0x00, port + FCR); /* Disable FIFOs */ - - /* Re-enable console messages, if we shut them down */ - if (sif->console) - openconsole(&dev_null_r, &dev_stdcon_w); -} |