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https://github.com/AsahiLinux/u-boot
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7a6a7d10e6
There is a limitation (or bug?) of nios2 toolchain. The nios2 gcc didn't generate correct code when the reset vector is passed as a constant. It just generated a direct "call", which was wrong when the reset vector was not located in the same 256MB span as u-boot. The "Nios II Processor Reference Handbook" said, "call can transfer execution anywhere within the 256 MByte range determined by PC31..28. The Nios II GNU linker does not automatically handle cases in which the address is out of this range." So we have to use registered "callr" instruction to do the job. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Signed-off-by: Scott McNutt <smcnutt@psyent.com>
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/*
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __ASM_NIOS2_SYSTEM_H_
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#define __ASM_NIOS2_SYSTEM_H_
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#define local_irq_enable() __asm__ __volatile__ ( \
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"rdctl r8, status\n" \
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"ori r8, r8, 1\n" \
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"wrctl status, r8\n" \
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: : : "r8")
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#define local_irq_disable() __asm__ __volatile__ ( \
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"rdctl r8, status\n" \
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"andi r8, r8, 0xfffe\n" \
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"wrctl status, r8\n" \
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: : : "r8")
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#define local_save_flags(x) __asm__ __volatile__ ( \
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"rdctl r8, status\n" \
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"mov %0, r8\n" \
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: "=r" (x) : : "r8", "memory")
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#define local_irq_restore(x) __asm__ __volatile__ ( \
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"mov r8, %0\n" \
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"wrctl status, r8\n" \
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: : "r" (x) : "r8", "memory")
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/* For spinlocks etc */
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#define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } \
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while (0)
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#define irqs_disabled() \
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({ \
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unsigned long flags; \
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local_save_flags(flags); \
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((flags & NIOS2_STATUS_PIE_MSK) == 0x0); \
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})
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/* indirect call to go beyond 256MB limitation of toolchain */
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#define nios2_callr(addr) __asm__ __volatile__ ( \
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"callr %0" \
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: : "r" (addr))
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#endif /* __ASM_NIOS2_SYSTEM_H */
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