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crc16: banked wrapper for cross-bank callers

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The lookup tables live in BANK1, so the routine switches the code bank to
reach them with movc and never switches it back. That is the contract the
__naked declaration already implied: same bank or common segment only.
The name now says it.

crc16_bank1 is the routine unchanged. crc16 becomes a __banked wrapper in
BANK1, so a caller from another bank has its own bank put back by
__sdcc_banked_ret. The two existing call sites take the direct path and
pay nothing.
This commit is contained in:
d00f committed 2026-09-09 01:52:12 +02:00
1 parent dd09be9dd0
commit 53f12a42c5
3 files changed
+12 -6
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crc16.asm
+7 -1
View File
@@ -3,6 +3,8 @@
;
.globl _crc_value
.globl _crc16
.globl _crc16_bank1
.globl __sdcc_banked_ret
.equ BANK, 0x96
; .equ DPS, 0x86
; Variable in XMEM holding current CRC16 value, being updated
@@ -18,7 +20,7 @@ _crc_value::
.area HOME (CODE)
.area CSEG (CODE)
; .area BANK1 (CODE)
_crc16:
_crc16_bank1:
mov BANK, #1
push dph
push dpl
@@ -52,6 +54,10 @@ _crc16:
.area BANK1 (CODE)
_crc16:
lcall _crc16_bank1
ljmp __sdcc_banked_ret
crc16_table_l:
.byte #0x00, #0xc1, #0x81, #0x40, #0x01, #0xc0, #0x80, #0x41
.byte #0x01, #0xc0, #0x80, #0x41, #0x00, #0xc1, #0x81, #0x40
httpd/httpd.c
+3 -3
View File
@@ -89,7 +89,7 @@ __xdata uint32_t last_session_use;
extern __xdata uint16_t crc_value;
__xdata uint16_t crc_final;
void crc16(__xdata uint8_t *v) __naked;
void crc16_bank1(__xdata uint8_t *v) __naked;
inline uint8_t is_separator(uint8_t c)
@@ -518,7 +518,7 @@ uint8_t stream_upload(void)
if (upload_settings.p[upload_settings.bptr] == boundary[bindex]) {
if (!bindex)
crc_final = crc_value;
crc16(upload_settings.p + upload_settings.bptr);
crc16_bank1(upload_settings.p + upload_settings.bptr);
upload_settings.bptr++;
bindex++;
} else {
@@ -527,7 +527,7 @@ uint8_t stream_upload(void)
write_len += bindex;
bindex = 0;
}
crc16(upload_settings.p + upload_settings.bptr);
crc16_bank1(upload_settings.p + upload_settings.bptr);
flash_buf[write_len++] = upload_settings.p[upload_settings.bptr++];
if (write_len >= FLASH_PAGE_SIZE) {
dbg_string("len: "); dbg_short(write_len); dbg_char(' ');
rtlplayground.c
+2 -2
View File
@@ -32,7 +32,7 @@ extern __xdata uint32_t flash_size;
extern __xdata uint16_t crc_value;
__xdata struct machine_runtime machine_detected;
void crc16(__xdata uint8_t *v) __naked;
void crc16_bank1(__xdata uint8_t *v) __naked;
void flash_default_config(void);
void early_boot_handle_button(void);
@@ -2095,7 +2095,7 @@ void check_and_flash_update_image(void)
flash_read_bulk(flash_buf);
bptr = flash_buf;
for (j = 0; j < FLASH_BUF_SIZE; j++) {
crc16(bptr++);
crc16_bank1(bptr++);
}
source += FLASH_BUF_SIZE;
if (i%16 == 0) write_char('.');