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Perform more optimization in supercard platform (#107)

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This commit is contained in:
Edoardo Lolletti
2026-01-12 21:23:02 +01:00
committed by GitHub
parent 08cf835b05
commit 61ab97091a
6 changed files with 174 additions and 111 deletions
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127
arm9/source/patches/platform/supercard/sclite/SuperCardLiteImpl.s
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@@ -40,12 +40,19 @@
.section "sclite_sd_command_drop", "ax"
@ void sclite_sdCommandAndDropResponse6(uint32_t dummy, uint32_t argument, SD_COMMANDS command)
@ command is passed in r2
@ command is passed in r2, in r6 is the pointer to sccmn_sdSendClock10
BEGIN_THUMB_FUNCTION sclite_sdCommandAndDropResponse6
push {lr}
cmp r2, #0x52
@ if command is READ_MULTIPLE_BLOCK, don't send extra clock cycles
beq 1f
@ we need to call sccmn_sdSendClock10 after the command is sent, push sccmn_sdSendClock10 and the lr to the stack
push {r6}
1:
@ among the pushed registers there are the command and
@ argument one, which are then used at the loop to
@ send the sd command
push {r1-r7,lr}
push {r1-r7}
@ loads reg_scsd_cmd
movs r7, #0x98
@@ -100,8 +107,11 @@ SDCommand_drop_resp:
subs r6, r6, #1
bne SDCommand_drop_resp
@ restore stack space
@ we pop from the stack r6 as pc, which corresponds to sccmn_sdSendClock10 or lr, if it is sccmn_sdSendClock10 that function
@ is called, and that function doesn't push a new lr but pops a preexisting one from the stack, which in our case is the
@ lr provided to this function
pop {r1-r7,pc}
.balign 4
.pool
@@ -110,7 +120,7 @@ SDCommand_drop_resp:
BEGIN_THUMB_FUNCTION sclite_writeSector
push {r1,r2,r4-r7,lr}
@ load EXMEMCNT register
@ load EXMEMCNT register into r7
LOAD_EXMEMCNT
@ r1 for now holds the sector
@@ -120,80 +130,96 @@ sclite_writeSectorSdhcLabel:
lsls r1, r0, #9
@ movs r1, r0
@ r4 sccmn_changeMode
@ r5 sclite_sdCommandAndDropResponse6
@ r6 sccmn_sdSendClock10
adr r3, sccmn_changeMode_writeInterworkLite_address
ldmia r3!, {r4-r6}
@ enable sd access
@ this function won't touch r1
@ this function won't touch anything
movs r0, #3
CALL sccmn_changeMode writeInterwork
@ call sccmn_changeMode
bl interwork_r4
@ WRITE_MULTIPLE_BLOCK
@ puts the value in r2
SD_COMMAND_ARGUMENT #25
@ 2nd parameter is in r1 from above
CALL sclite_sdCommandAndDropResponse6 writeInterwork
@ call sclite_sdCommandAndDropResponse6
bl interwork_r5
@ this function will trash r4 but leave r0 and r1 untouched
CALL sccmn_sdSendClock10 writeInterwork
@ load the rest of the functions
@ r4 sccmn_sdio4BitCrc16
@ r5 sclite_writeData
ldmia r3!, {r4-r5}
@ loads the saved r0 and r2 (readnum)
@ loads the saved r1 (buff) and r2 (writenum)
@ into r0 and r1
pop {r0,r1}
write_sector_loop:
@ all the functions called in this loop don't change the value of r0 and r1
@ all the functions called in this loop don't change the value of any register
@ except sclite_writeData, which will increase r0 by 512
@ sccmn_sdio4BitCrc16 will write the checksum to r2-r3
CALL sccmn_sdio4BitCrc16 writeInterwork
@ first argument is buffer
@ regs r2 and r3 hold the crc
CALL sclite_writeData writeInterwork
@ this function will trash r4 but leave r0 and r1 untouched
CALL sccmn_sdSendClock10 writeInterwork
@ call sccmn_sdio4BitCrc16, this function will then tail call to r5 (sclite_writeData)
bl interwork_r4
subs r1, #1
bne write_sector_loop
adr r3, sccmn_changeMode_writeInterworkLite_address
@ r4 sccmn_changeMode
@ r5 sclite_sdCommandAndDropResponse6
ldmia r3!, {r4-r5}
@ STOP_TRANSMISSION
@ puts the value in r2
SD_COMMAND_ARGUMENT #12
@ 2nd parameter is passed in r1
@ and from the loop above r1 is already 0
CALL sclite_sdCommandAndDropResponse6 writeInterwork
@ this function will trash r4 but leave r0 and r1 untouched
CALL sccmn_sdSendClock10 writeInterwork
@ call sclite_sdCommandAndDropResponse6
bl interwork_r5
@ loads sd_dataadd
movs r0, #0x90
lsls r0, r0, #20
@ while(*r1 &0x100) == 0
@ while(*r0 &0x100) == 0
beginwhile_WriteSector:
ldrh r1, [r0]
lsrs r1, #9
bcc beginwhile_WriteSector
movs r0, #1
CALL sccmn_changeMode writeInterwork
@ call sccmn_changeMode writeInterwork
bl interwork_r4
@ restore EXMEMCNT register
RESTORE_EXMEMCNT
pop {r4-r7,pc}
INTERWORK writeInterwork
INTERWORK_FUNCTION sclite_writeData writeInterwork
INTERWORK_FUNCTION sccmn_sdio4BitCrc16 writeInterwork
INTERWORK_FUNCTION sccmn_sdSendClock10 writeInterwork
INTERWORK_FUNCTION sccmn_changeMode writeInterwork
INTERWORK_FUNCTION sclite_sdCommandAndDropResponse6 writeInterwork
interwork_r4:
bx r4
interwork_r5:
bx r5
.balign 4
.pool
INTERWORK_FUNCTION sccmn_changeMode writeInterwork
INTERWORK_FUNCTION sclite_sdCommandAndDropResponse6 writeInterwork
INTERWORK_FUNCTION sccmn_sdSendClock10 writeInterwork
INTERWORK_FUNCTION sccmn_sdio4BitCrc16 writeInterwork
INTERWORK_FUNCTION sclite_writeData writeInterwork
.section "sclite_read_sector", "ax"
@ bool sclite_readSector(uint32_t sector, uint8_t *buff, uint32_t readnum)
BEGIN_THUMB_FUNCTION sclite_readSector
push {r1,r2-r7,lr}
@ load EXMEMCNT register into r7
LOAD_EXMEMCNT
@ r1 for now holds the sector
@@ -204,21 +230,22 @@ sclite_readSectorSdhcLabel:
@ movs r1, r0
@ enable sd access
@ this function won't touch r1
@ this function won't touch anything
movs r0, #3
CALL sccmn_changeMode readInterwork
@ READ_MULTIPLE_BLOCK
@ puts the value in r2
SD_COMMAND_ARGUMENT #18
@ 2nd parameter is in r1 from above
CALL sclite_sdCommandAndDropResponse6 readInterwork
@ loads the saved r0 and r2 (writenum)
@ loads the saved r1 (buff) and r2 (readnum)
@ into r0 and r1
pop {r0,r1}
read_sector_loop:
@ all the functions called in this loop don't change the value of r0 or r1
@ all the functions called in this loop don't change the value of any register
@ except sclite_readData, which will increase r0 by 512 automatically
CALL sclite_readData readInterwork
@@ -226,14 +253,15 @@ read_sector_loop:
bne read_sector_loop
@ STOP_TRANSMISSION
@ puts the value in r2
SD_COMMAND_ARGUMENT #12
@ 2nd parameter is passed in r1
@ and from the loop above r1 is already 0
LOAD_INTERWORK_FUNCTION sccmn_sdSendClock10 readInterwork r6
CALL sclite_sdCommandAndDropResponse6 readInterwork
@ this function will trash r4 but leave r0 and r1 untouched
CALL sccmn_sdSendClock10 readInterwork
@ this function won't touch anything
@ CALL sccmn_sdSendClock10 readInterwork
movs r0, #1
@@ -312,15 +340,17 @@ sclite_readData_loop:
.section "sclite_write_data", "ax"
@ void sclite_writeData(void*& buffer, int value_to_keep, int crc_buff1, int crc_buff2)
@ this function updates r0, leaves r1 untouched and thrashes r4
@ this function updates r0 and leaves everything else untouched
@ in r6 is the pointer to sccmn_sdSendClock10
BEGIN_THUMB_FUNCTION sclite_writeData
@ push sccmn_sdSendClock10 and the current lr reg to the stack, so that at the end we can
@ call in sequence sccmn_sdSendClock10 and then return
push {r6}
push {r1-r7}
@ loads sd_dataadd
movs r4, #0x90
lsls r4, r4, #20
@ save sd_dataadd constant above for later
push {r1-r7,lr}
waitOnWriteFalse_WriteData:
ldrh r1, [r4]
lsrs r1, #9
@@ -356,9 +386,12 @@ sclite_writeData_loop:
@ r1 holds a value that has not to be changed
@ r2-r3 hold the crc value to be written
@ r4 holds the value sd_dataadd saved at the start
pop {r1-r4}
pop {r1-r3}
stmia r7!, {r2-r3}
@ loads sd_dataadd
movs r4, #0x90
lsls r4, r4, #20
@ write end bit
movs r3, #0xff
@@ -374,7 +407,11 @@ waitOnWriteTrue_WriteData:
str r3, [r4]
str r3, [r4]
pop {r5-r7,pc}
@ we pop from the stack r6 as pc, which corresponds to sccmn_sdSendClock10 so we jump to it
@ sccmn_sdSendClock10 doesn't push a new lr but pops a preexisting one from the stack, which in our case is the
@ lr provided to this function
pop {r4-r7,pc}
.balign 4
.pool