![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/*
|
|
* include/asm-v850/rte_multi.c -- Support for Multi debugger monitor ROM
|
|
* on Midas lab RTE-CB series of evaluation boards
|
|
*
|
|
* Copyright (C) 2001,02,03 NEC Electronics Corporation
|
|
* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/machdep.h>
|
|
|
|
#define IRQ_ADDR(irq) (0x80 + (irq) * 0x10)
|
|
|
|
/* A table of which interrupt vectors to install, since blindly
|
|
installing all of them makes the debugger stop working. This is a
|
|
list of offsets in the interrupt vector area; each entry means to
|
|
copy that particular 16-byte vector. An entry less than zero ends
|
|
the table. */
|
|
static long multi_intv_install_table[] = {
|
|
/* Trap vectors */
|
|
0x40, 0x50,
|
|
|
|
#ifdef CONFIG_RTE_CB_MULTI_DBTRAP
|
|
/* Illegal insn / dbtrap. These are used by multi, so only handle
|
|
them if configured to do so. */
|
|
0x60,
|
|
#endif
|
|
|
|
/* GINT1 - GINT3 (note, not GINT0!) */
|
|
IRQ_ADDR (IRQ_GINT(1)),
|
|
IRQ_ADDR (IRQ_GINT(2)),
|
|
IRQ_ADDR (IRQ_GINT(3)),
|
|
|
|
/* Timer D interrupts (up to 4 timers) */
|
|
IRQ_ADDR (IRQ_INTCMD(0)),
|
|
#if IRQ_INTCMD_NUM > 1
|
|
IRQ_ADDR (IRQ_INTCMD(1)),
|
|
#if IRQ_INTCMD_NUM > 2
|
|
IRQ_ADDR (IRQ_INTCMD(2)),
|
|
#if IRQ_INTCMD_NUM > 3
|
|
IRQ_ADDR (IRQ_INTCMD(3)),
|
|
#endif
|
|
#endif
|
|
#endif
|
|
|
|
/* UART interrupts (up to 3 channels) */
|
|
IRQ_ADDR (IRQ_INTSER (0)), /* err */
|
|
IRQ_ADDR (IRQ_INTSR (0)), /* rx */
|
|
IRQ_ADDR (IRQ_INTST (0)), /* tx */
|
|
#if IRQ_INTSR_NUM > 1
|
|
IRQ_ADDR (IRQ_INTSER (1)), /* err */
|
|
IRQ_ADDR (IRQ_INTSR (1)), /* rx */
|
|
IRQ_ADDR (IRQ_INTST (1)), /* tx */
|
|
#if IRQ_INTSR_NUM > 2
|
|
IRQ_ADDR (IRQ_INTSER (2)), /* err */
|
|
IRQ_ADDR (IRQ_INTSR (2)), /* rx */
|
|
IRQ_ADDR (IRQ_INTST (2)), /* tx */
|
|
#endif
|
|
#endif
|
|
|
|
-1
|
|
};
|
|
|
|
/* Early initialization for kernel using Multi debugger ROM monitor. */
|
|
void __init multi_init (void)
|
|
{
|
|
/* We're using the Multi debugger monitor, so we have to install
|
|
the interrupt vectors. The monitor doesn't allow them to be
|
|
initially downloaded into their final destination because
|
|
it's in the monitor's scratch-RAM area. Unfortunately, Multi
|
|
also doesn't deal correctly with ELF sections where the LMA
|
|
and VMA differ -- it just ignores the LMA -- so we can't use
|
|
that feature to work around the problem. What we do instead
|
|
is just put the interrupt vectors into a normal section, and
|
|
do the necessary copying and relocation here. Since the
|
|
interrupt vector basically only contains `jr' instructions
|
|
and no-ops, it's not that hard. */
|
|
extern unsigned long _intv_load_start, _intv_start;
|
|
register unsigned long *src = &_intv_load_start;
|
|
register unsigned long *dst = (unsigned long *)INTV_BASE;
|
|
register unsigned long jr_fixup = (char *)&_intv_start - (char *)dst;
|
|
register long *ii;
|
|
|
|
/* Copy interrupt vectors as instructed by multi_intv_install_table. */
|
|
for (ii = multi_intv_install_table; *ii >= 0; ii++) {
|
|
/* Copy 16-byte interrupt vector at offset *ii. */
|
|
int boffs;
|
|
for (boffs = 0; boffs < 0x10; boffs += sizeof *src) {
|
|
/* Copy a single word, fixing up the jump offs
|
|
if it's a `jr' instruction. */
|
|
int woffs = (*ii + boffs) / sizeof *src;
|
|
unsigned long word = src[woffs];
|
|
|
|
if ((word & 0xFC0) == 0x780) {
|
|
/* A `jr' insn, fix up its offset (and yes, the
|
|
weird half-word swapping is intentional). */
|
|
unsigned short hi = word & 0xFFFF;
|
|
unsigned short lo = word >> 16;
|
|
unsigned long udisp22
|
|
= lo + ((hi & 0x3F) << 16);
|
|
long disp22 = (long)(udisp22 << 10) >> 10;
|
|
|
|
disp22 += jr_fixup;
|
|
|
|
hi = ((disp22 >> 16) & 0x3F) | 0x780;
|
|
lo = disp22 & 0xFFFF;
|
|
|
|
word = hi + (lo << 16);
|
|
}
|
|
|
|
dst[woffs] = word;
|
|
}
|
|
}
|
|
}
|