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Clean up BaS linker script symbols.

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This commit is contained in:
Vincent Rivière
2012-10-20 15:50:36 +00:00
parent a4d56a8497
commit f18929b8a5
2 changed files with 21 additions and 9 deletions
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4
BaS_GNU/bas.lk.S
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@@ -70,7 +70,6 @@ SECTIONS {
objs/supervisor.o(.text)
objs/ewf.o(.text)
objs/illegal_instruction.o(.text)
_bas = .;
} > flash
.bas _Bas_base : AT (ADDR(.text) + SIZEOF(.text))
@@ -79,4 +78,7 @@ SECTIONS {
_bas_end = ABSOLUTE(.);
} > ram
__BAS_LMA = LOADADDR(.bas);
__BAS_VMA = ADDR(.bas);
__BAS_SIZE = SIZEOF(.bas);
}

24
BaS_GNU/sources/sysinit.c
View File

@@ -665,13 +665,21 @@ livo:
uart_out_word(0x0a0d);
}
void initialize_hardware(void) {
extern uint32_t bas; /* source address to copy bas from (from linker script) FIXME: beware of possible alignment */
extern uint32_t bas_end; /* end of BaS code to copy (from linker script) */
extern uint32_t BaS; /* BaS routine to jump to after copy */
/* Symbols from the linker script */
extern uint8_t _BAS_LMA[];
#define BAS_LMA ((uint32_t)_BAS_LMA) /* where the BaS is stored in flash */
extern uint8_t _BAS_VMA[];
#define BAS_VMA ((uint32_t)_BAS_VMA) /* where the BaS is run in RAM */
extern uint8_t _BAS_SIZE[];
#define BAS_SIZE ((uint32_t)_BAS_SIZE) /* size of the BaS, in bytes */
void initialize_hardware(void) {
/* used in copy loop */
uint32_t *src; /* src address to read from flash */
uint32_t *end; /* end address to read from flash */
uint32_t *dst; /* destination address to copy to */
uint32_t *jmp; /* address of BaS() routine to jmp at after copy */
@@ -698,16 +706,18 @@ void initialize_hardware(void) {
}
/* copy the BaS code contained in flash to its final location */
src = (uint32_t *)&bas;
dst = jmp = (uint32_t *)&BaS;
src = (uint32_t *)BAS_LMA;
end = (uint32_t *)(BAS_LMA + BAS_SIZE);
dst = jmp = (uint32_t *)BAS_VMA;
/* FIXME: beware of possible alignment */
do
{
*dst++ = *src++;
*dst++ = *src++;
*dst++ = *src++;
*dst++ = *src++;
} while (dst < &bas_end);
} while (src < end);
/* we have copied a code area, so flush the caches */
flush_and_invalidate_caches();