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134 lines
4.1 KiB
134 lines
4.1 KiB
// 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 <[email protected]> |
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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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