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Blackfin: calculate on-chip lengths at link time rather than run time

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Since the link sizes never change at runtime, push the calculation out to
the linker script to save some useless calculation costs.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2009-09-23 20:34:48 +00:00
parent 13048f8866
commit 5cd82a6d58
3 changed files with 44 additions and 39 deletions
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16
arch/blackfin/include/asm/sections.h
View File

@ -13,10 +13,18 @@ extern unsigned long memory_mtd_start, memory_mtd_end, mtd_size;
extern unsigned long _ramstart, _ramend, _rambase;
extern unsigned long memory_start, memory_end, physical_mem_end;
extern char _stext_l1[], _etext_l1[], _sdata_l1[], _edata_l1[], _sbss_l1[],
_ebss_l1[], _l1_lma_start[], _sdata_b_l1[], _sbss_b_l1[], _ebss_b_l1[],
_stext_l2[], _etext_l2[], _sdata_l2[], _edata_l2[], _sbss_l2[],
_ebss_l2[], _l2_lma_start[];
/*
* The weak markings on the lengths might seem weird, but this is required
* in order to make gcc accept the fact that these may actually have a value
* of 0 (since they aren't actually addresses, but sizes of sections).
*/
extern char _stext_l1[], _etext_l1[], _text_l1_lma[], __weak _text_l1_len[];
extern char _sdata_l1[], _edata_l1[], _sbss_l1[], _ebss_l1[],
_data_l1_lma[], __weak _data_l1_len[];
extern char _sdata_b_l1[], _edata_b_l1[], _sbss_b_l1[], _ebss_b_l1[],
_data_b_l1_lma[], __weak _data_b_l1_len[];
extern char _stext_l2[], _etext_l2[], _sdata_l2[], _edata_l2[],
_sbss_l2[], _ebss_l2[], _l2_lma[], __weak _l2_len[];
#include <asm/mem_map.h>

39
arch/blackfin/kernel/setup.c
View File

@ -178,10 +178,10 @@ void __init bfin_cache_init(void)
void __init bfin_relocate_l1_mem(void)
{
unsigned long l1_code_length;
unsigned long l1_data_a_length;
unsigned long l1_data_b_length;
unsigned long l2_length;
unsigned long text_l1_len = (unsigned long)_text_l1_len;
unsigned long data_l1_len = (unsigned long)_data_l1_len;
unsigned long data_b_l1_len = (unsigned long)_data_b_l1_len;
unsigned long l2_len = (unsigned long)_l2_len;
early_shadow_stamp();
@ -201,30 +201,23 @@ void __init bfin_relocate_l1_mem(void)
blackfin_dma_early_init();
/* if necessary, copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
l1_code_length = _etext_l1 - _stext_l1;
if (l1_code_length)
early_dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
/* if necessary, copy L1 text to L1 instruction SRAM */
if (L1_CODE_LENGTH && text_l1_len)
early_dma_memcpy(_stext_l1, _text_l1_lma, text_l1_len);
/* if necessary, copy _sdata_l1 to _sbss_l1 to L1 data bank A SRAM */
l1_data_a_length = _sbss_l1 - _sdata_l1;
if (l1_data_a_length)
early_dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
/* if necessary, copy L1 data to L1 data bank A SRAM */
if (L1_DATA_A_LENGTH && data_l1_len)
early_dma_memcpy(_sdata_l1, _data_l1_lma, data_l1_len);
/* if necessary, copy _sdata_b_l1 to _sbss_b_l1 to L1 data bank B SRAM */
l1_data_b_length = _sbss_b_l1 - _sdata_b_l1;
if (l1_data_b_length)
early_dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
l1_data_a_length, l1_data_b_length);
/* if necessary, copy L1 data B to L1 data bank B SRAM */
if (L1_DATA_B_LENGTH && data_b_l1_len)
early_dma_memcpy(_sdata_b_l1, _data_b_l1_lma, data_b_l1_len);
early_dma_memcpy_done();
/* if necessary, copy _stext_l2 to _edata_l2 to L2 SRAM */
if (L2_LENGTH != 0) {
l2_length = _sbss_l2 - _stext_l2;
if (l2_length)
memcpy(_stext_l2, _l2_lma_start, l2_length);
}
/* if necessary, copy L2 text/data to L2 SRAM */
if (L2_LENGTH && l2_len)
memcpy(_stext_l2, _l2_lma, l2_len);
}
/* add_memory_region to memmap */

28
arch/blackfin/kernel/vmlinux.lds.S
View File

@ -123,8 +123,6 @@ SECTIONS
EXIT_DATA
}
__l1_lma_start = .;
.text_l1 L1_CODE_START : AT(LOADADDR(.exit.data) + SIZEOF(.exit.data))
{
. = ALIGN(4);
@ -136,9 +134,11 @@ SECTIONS
. = ALIGN(4);
__etext_l1 = .;
}
ASSERT (SIZEOF(.text_l1) <= L1_CODE_LENGTH, "L1 text overflow!")
__text_l1_lma = LOADADDR(.text_l1);
__text_l1_len = SIZEOF(.text_l1);
ASSERT (__text_l1_len <= L1_CODE_LENGTH, "L1 text overflow!")
.data_l1 L1_DATA_A_START : AT(LOADADDR(.text_l1) + SIZEOF(.text_l1))
.data_l1 L1_DATA_A_START : AT(__text_l1_lma + __text_l1_len)
{
. = ALIGN(4);
__sdata_l1 = .;
@ -154,9 +154,11 @@ SECTIONS
. = ALIGN(4);
__ebss_l1 = .;
}
ASSERT (SIZEOF(.data_l1) <= L1_DATA_A_LENGTH, "L1 data A overflow!")
__data_l1_lma = LOADADDR(.data_l1);
__data_l1_len = SIZEOF(.data_l1);
ASSERT (__data_l1_len <= L1_DATA_A_LENGTH, "L1 data A overflow!")
.data_b_l1 L1_DATA_B_START : AT(LOADADDR(.data_l1) + SIZEOF(.data_l1))
.data_b_l1 L1_DATA_B_START : AT(__data_l1_lma + __data_l1_len)
{
. = ALIGN(4);
__sdata_b_l1 = .;
@ -169,11 +171,11 @@ SECTIONS
. = ALIGN(4);
__ebss_b_l1 = .;
}
ASSERT (SIZEOF(.data_b_l1) <= L1_DATA_B_LENGTH, "L1 data B overflow!")
__data_b_l1_lma = LOADADDR(.data_b_l1);
__data_b_l1_len = SIZEOF(.data_b_l1);
ASSERT (__data_b_l1_len <= L1_DATA_B_LENGTH, "L1 data B overflow!")
__l2_lma_start = LOADADDR(.data_b_l1) + SIZEOF(.data_b_l1);
.text_data_l2 L2_START : AT(LOADADDR(.data_b_l1) + SIZEOF(.data_b_l1))
.text_data_l2 L2_START : AT(__data_b_l1_lma + __data_b_l1_len)
{
. = ALIGN(4);
__stext_l2 = .;
@ -195,12 +197,14 @@ SECTIONS
. = ALIGN(4);
__ebss_l2 = .;
}
ASSERT (SIZEOF(.text_data_l2) <= L2_LENGTH, "L2 overflow!")
__l2_lma = LOADADDR(.text_data_l2);
__l2_len = SIZEOF(.text_data_l2);
ASSERT (__l2_len <= L2_LENGTH, "L2 overflow!")
/* Force trailing alignment of our init section so that when we
* free our init memory, we don't leave behind a partial page.
*/
. = LOADADDR(.text_data_l2) + SIZEOF(.text_data_l2);
. = __l2_lma + __l2_len;
. = ALIGN(PAGE_SIZE);
___init_end = .;