e04ca28812
Removes the "-unix" element and with it any trademark exposure to The
Open Group.
The split follows the ecosystem layout: SchOS is the system, and the
kernel has its own name. Kernel-identity strings are the only places
that take SchIFT -- uname(2) sysname, /proc/version, and the two licence
sentences that say "kernel" outright. That is what every Unix does here:
`uname -s` on Linux reports the kernel, not the distribution. Everything
a user reads as the product -- panic screen, boot menu, error prefixes,
docs, LICENSE, NOTICE -- is SchOS.
schunix.img is schos.img, the logo assets and the musl TLS patch are
renamed, and __SCHUNIX__ is __SCHOS__ (the define and the patch that
consumes it moved together).
Two things the rename broke, both found by the bootcheck suite:
- shmtest wrote "SCHUNIX-MMAP-OK" with a hardcoded length of 15 and
compared it back by hand-counted offsets (m[3]=='U', m[14]=='K').
The shorter marker left the write running two bytes past the literal
and the compare reading past the data, failing a file-backed mmap
that was working correctly. Now written and compared through one
constant with sizeof.
- bootcheck asserted a 31-byte file after appending to
"hello-from-schunix"; the shorter string makes it 29.
Both are the same mistake: a string literal whose length is written out
somewhere else. Full suite green -- base, Tty, Ps, Sock, Fb, Usb, Evdev.
95 lines
1.6 KiB
C
95 lines
1.6 KiB
C
// Intel 8250 serial port (UART).
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#include "types.h"
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#include "defs.h"
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#include "irq.h"
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#include "param.h"
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#include "traps.h"
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#include "spinlock.h"
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#include "sleeplock.h"
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#include "fs.h"
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#include "file.h"
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#include "mmu.h"
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#include "proc.h"
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#include "x86.h"
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#define COM1 0x3f8
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static int uart; // is there a uart?
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void
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uartearlyinit(void)
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{
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char *p;
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// Turn off the FIFO
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outb(COM1+2, 0);
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// 9600 baud, 8 data bits, 1 stop bit, parity off.
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outb(COM1+3, 0x80); // Unlock divisor
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outb(COM1+0, 115200/9600);
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outb(COM1+1, 0);
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outb(COM1+3, 0x03); // Lock divisor, 8 data bits.
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outb(COM1+4, 0);
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outb(COM1+1, 0x01); // Enable receive interrupts.
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// If status is 0xFF, no serial port.
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if(inb(COM1+5) == 0xFF)
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return;
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uart = 1;
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// Announce that we're here.
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for(p="SchOS UART...\n"; *p; p++)
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uartputc(*p);
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}
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// irq.c hands every handler an opaque argument, because a driver with two
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// controllers needs to know which one interrupted. There is only one COM1.
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static void
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uart_irq(void *arg)
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{
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(void)arg;
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uartintr();
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}
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void
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uartinit(void)
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{
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if(!uart)
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return;
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// Acknowledge pre-existing interrupt conditions;
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// enable interrupts.
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inb(COM1+2);
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inb(COM1+0);
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irq_register(IRQ_COM1, uart_irq, 0, "serial", 0);
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}
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void
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uartputc(int c)
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{
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int i;
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if(!uart)
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return;
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for(i = 0; i < 128 && !(inb(COM1+5) & 0x20); i++)
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microdelay(10);
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outb(COM1+0, c);
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}
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static int
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uartgetc(void)
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{
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if(!uart)
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return -1;
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if(!(inb(COM1+5) & 0x01))
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return -1;
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return inb(COM1+0);
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}
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void
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uartintr(void)
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{
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consoleintr(uartgetc);
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}
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