135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Code shared between SPL and U-Boot proper
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*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Unfortunately x86 or ARM can't compile this code as gd cannot be assigned */
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#if !defined(CONFIG_X86) && !defined(CONFIG_ARM)
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__weak void arch_setup_gd(struct global_data *gd_ptr)
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{
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gd = gd_ptr;
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}
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#endif /* !CONFIG_X86 && !CONFIG_ARM */
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/*
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* Allocate reserved space for use as 'globals' from 'top' address and
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* return 'bottom' address of allocated space
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*
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* Notes:
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*
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* Actual reservation cannot be done from within this function as
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* it requires altering the C stack pointer, so this will be done by
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* the caller upon return from this function.
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*
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* IMPORTANT:
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*
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* Alignment constraints may differ for each 'chunk' allocated. For now:
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*
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* - GD is aligned down on a 16-byte boundary
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*
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* - the early malloc arena is not aligned, therefore it follows the stack
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* alignment constraint of the architecture for which we are bulding.
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*
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* - GD is allocated last, so that the return value of this functions is
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* both the bottom of the reserved area and the address of GD, should
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* the calling context need it.
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*/
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ulong board_init_f_alloc_reserve(ulong top)
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{
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/* Reserve early malloc arena */
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#if CONFIG_VAL(SYS_MALLOC_F_LEN)
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top -= CONFIG_VAL(SYS_MALLOC_F_LEN);
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#endif
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/* LAST : reserve GD (rounded up to a multiple of 16 bytes) */
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top = rounddown(top-sizeof(struct global_data), 16);
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return top;
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}
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/*
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* Initialize reserved space (which has been safely allocated on the C
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* stack from the C runtime environment handling code).
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*
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* Notes:
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*
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* Actual reservation was done by the caller; the locations from base
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* to base+size-1 (where 'size' is the value returned by the allocation
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* function above) can be accessed freely without risk of corrupting the
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* C runtime environment.
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*
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* IMPORTANT:
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*
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* Upon return from the allocation function above, on some architectures
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* the caller will set gd to the lowest reserved location. Therefore, in
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* this initialization function, the global data MUST be placed at base.
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*
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* ALSO IMPORTANT:
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*
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* On some architectures, gd will already be good when entering this
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* function. On others, it will only be good once arch_setup_gd() returns.
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* Therefore, global data accesses must be done:
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*
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* - through gd_ptr if before the call to arch_setup_gd();
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*
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* - through gd once arch_setup_gd() has been called.
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*
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* Do not use 'gd->' until arch_setup_gd() has been called!
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*
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* IMPORTANT TOO:
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*
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* Initialization for each "chunk" (GD, early malloc arena...) ends with
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* an incrementation line of the form 'base += <some size>'. The last of
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* these incrementations seems useless, as base will not be used any
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* more after this incrementation; but if/when a new "chunk" is appended,
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* this increment will be essential as it will give base right value for
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* this new chunk (which will have to end with its own incrementation
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* statement). Besides, the compiler's optimizer will silently detect
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* and remove the last base incrementation, therefore leaving that last
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* (seemingly useless) incrementation causes no code increase.
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*/
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void board_init_f_init_reserve(ulong base)
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{
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struct global_data *gd_ptr;
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/*
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* clear GD entirely and set it up.
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* Use gd_ptr, as gd may not be properly set yet.
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*/
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gd_ptr = (struct global_data *)base;
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/* zero the area */
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memset(gd_ptr, '\0', sizeof(*gd));
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/* set GD unless architecture did it already */
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#if !defined(CONFIG_ARM)
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arch_setup_gd(gd_ptr);
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#endif
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/* next alloc will be higher by one GD plus 16-byte alignment */
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base += roundup(sizeof(struct global_data), 16);
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/*
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* record early malloc arena start.
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* Use gd as it is now properly set for all architectures.
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*/
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#if CONFIG_VAL(SYS_MALLOC_F_LEN)
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/* go down one 'early malloc arena' */
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gd->malloc_base = base;
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/* next alloc will be higher by one 'early malloc arena' size */
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base += CONFIG_VAL(SYS_MALLOC_F_LEN);
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#endif
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}
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/*
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* Board-specific Platform code can reimplement show_boot_progress () if needed
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*/
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__weak void show_boot_progress(int val) {}
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