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https://github.com/brain-hackers/u-boot-brain
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781adb5710
In many cases, pointers to memory are passed around, and these pointers refer to U-Boot memory, not host memory. This in itself is not a problem. However, in a few places, we cast that pointer back to a ulong (being a U-Boot memory address). It is possible to convert many of these cases to avoid this. However there are data structures (e.g. struct bootm_headers) which use pointers. We could with a lot of effort adjust the structs and all code that uses them to use ulong instead of pointers. This seems like an unacceptable cost, since our objective with sandbox is to minimise the impact on U-Boot code while maximising the features available to sandbox. Therefore, create a map_to_sysmem() function which converts from a pointer to a U-Boot address. This can be used sparingly when needed. Signed-off-by: Simon Glass <sjg@chromium.org>
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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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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#include <common.h>
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#include <os.h>
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DECLARE_GLOBAL_DATA_PTR;
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int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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/* This is considered normal termination for now */
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os_exit(0);
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return 0;
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}
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/* delay x useconds */
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void __udelay(unsigned long usec)
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{
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os_usleep(usec);
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}
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unsigned long timer_get_us(void)
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{
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return os_get_nsec() / 1000;
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}
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int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
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{
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return -1;
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}
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int cleanup_before_linux(void)
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{
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return 0;
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}
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void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
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{
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return (void *)(gd->arch.ram_buf + paddr);
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}
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phys_addr_t map_to_sysmem(void *ptr)
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{
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return (u8 *)ptr - gd->arch.ram_buf;
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}
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void flush_dcache_range(unsigned long start, unsigned long stop)
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{
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}
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