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https://github.com/AsahiLinux/u-boot
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748da8abb0
The ROM API is thoroughly undocumented, but apparently passing the xor of the real arguments as an extra argument is required [1]. Also, we need to do the "save gd/restore gd" dance. These are both error-prone, and lead to a lot of code duplication. Since both imx8m[np] and imx8ulp SOCs have this, add a separate translation unit which is included precisely when the new CONFIG_IMX8_ROMAPI symbol is set, which provide convenience wrappers that take care of computing the xor value as well as doing the gd dance, and that thus have a more intuitive API. Subsequent patches will make use of these to reduce boilerplate. [1] One wonders, for example, if the check is only applied to the lower 32 bits, or if we're implicitly relying on all 64-bit pointer values we're passing effectively have 0 in the upper 32 bits. Reviewed-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
30 lines
580 B
C
30 lines
580 B
C
// SPDX-License-Identifier: GPL-2.0+
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#include <asm/global_data.h>
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#include <asm/arch/sys_proto.h>
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DECLARE_GLOBAL_DATA_PTR;
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u32 rom_api_download_image(u8 *dest, u32 offset, u32 size)
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{
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u32 xor = (uintptr_t)dest ^ offset ^ size;
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volatile gd_t *sgd = gd;
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u32 ret;
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ret = g_rom_api->download_image(dest, offset, size, xor);
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set_gd(sgd);
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return ret;
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}
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u32 rom_api_query_boot_infor(u32 info_type, u32 *info)
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{
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u32 xor = info_type ^ (uintptr_t)info;
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volatile gd_t *sgd = gd;
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u32 ret;
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ret = g_rom_api->query_boot_infor(info_type, info, xor);
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set_gd(sgd);
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return ret;
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}
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