diff options
Diffstat (limited to 'arch/v850/kernel/rte_cb_multi.c')
| -rw-r--r-- | arch/v850/kernel/rte_cb_multi.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/arch/v850/kernel/rte_cb_multi.c b/arch/v850/kernel/rte_cb_multi.c new file mode 100644 index 00000000000..963d55ab34c --- /dev/null +++ b/arch/v850/kernel/rte_cb_multi.c @@ -0,0 +1,121 @@ +/* + * 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; + } + } +} |