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- Log -----------------------------------------------------------------
commit 63ee447e3b4bcd2b48e15ed289e1c82a80145ff7
Author: Paul Cercueil <pa...@cr...>
Date: Mon Oct 21 07:46:29 2024 +0200
pvr: Add new function pvr_send_to_ta() (#817)
This function can be used to upload a 32-byte payload to the Tile
Accelerator.
The difference with the Direct Rendering approach is that the SQs
are not used, and therefore can be used for anything else.
Signed-off-by: Paul Cercueil <pa...@cr...>
Co-authored-by: Falco Girgis <gyr...@gm...>
-----------------------------------------------------------------------
Summary of changes:
kernel/arch/dreamcast/hardware/pvr/Makefile | 3 ++
.../arch/dreamcast/hardware/pvr/pvr_send_to_ta.s | 43 ++++++++++++++++++++++
kernel/arch/dreamcast/include/dc/pvr.h | 11 ++++++
3 files changed, 57 insertions(+)
create mode 100644 kernel/arch/dreamcast/hardware/pvr/pvr_send_to_ta.s
diff --git a/kernel/arch/dreamcast/hardware/pvr/Makefile b/kernel/arch/dreamcast/hardware/pvr/Makefile
index 1eda21b1..3d9f1a77 100644
--- a/kernel/arch/dreamcast/hardware/pvr/Makefile
+++ b/kernel/arch/dreamcast/hardware/pvr/Makefile
@@ -13,6 +13,9 @@ OBJS += pvr_buffers.o pvr_irq.o
# Init / Shutdown / Globals / Misc
OBJS += pvr_init_shutdown.o pvr_globals.o pvr_misc.o
+# Fast Tile Accelerator upload function
+OBJS += pvr_send_to_ta.o
+
# Fog
OBJS += pvr_fog.o
diff --git a/kernel/arch/dreamcast/hardware/pvr/pvr_send_to_ta.s b/kernel/arch/dreamcast/hardware/pvr/pvr_send_to_ta.s
new file mode 100644
index 00000000..11629bab
--- /dev/null
+++ b/kernel/arch/dreamcast/hardware/pvr/pvr_send_to_ta.s
@@ -0,0 +1,43 @@
+! KallistiOS ##version##
+!
+! arch/dreamcast/hardware/pvr/pvr_send_to_ta.s
+! Copyright (C) 2024 Paul Cercueil
+!
+! Fast function to upload geometry to the Tile Accelerator without SQs
+!
+
+.globl _pvr_send_to_ta
+
+_pvr_send_to_ta:
+ fschg
+ mov.l _irq_and,r1
+ mov #0x78,r2
+ mov.l _ta_addr,r3
+ stc sr,r0
+ and r0,r1
+ fmov @r4+,dr0
+ shll r2
+ fmov @r4+,dr2
+ or r2,r1
+ fmov @r4+,dr4
+ fmov @r4+,dr6
+ ldc r1,sr
+
+ movca.l r0,@r3
+ add #32,r3
+ fmov dr6,@-r3
+ fmov dr4,@-r3
+ fmov dr2,@-r3
+ fmov dr0,@-r3
+ fschg
+
+ ldc r0,sr
+
+ rts
+ ocbp @r3
+
+.align 2
+_irq_and:
+ .long 0xefffff0f
+_ta_addr:
+ .long 0x90000000
diff --git a/kernel/arch/dreamcast/include/dc/pvr.h b/kernel/arch/dreamcast/include/dc/pvr.h
index eb2ac36f..7ec55b35 100644
--- a/kernel/arch/dreamcast/include/dc/pvr.h
+++ b/kernel/arch/dreamcast/include/dc/pvr.h
@@ -2006,6 +2006,17 @@ void pvr_dr_init(pvr_dr_state_t *vtx_buf_ptr);
*/
void pvr_dr_finish(void);
+/** \brief Upload a 32-byte payload to the Tile Accelerator
+
+ Upload the given payload to the Tile Accelerator. The difference with the
+ Direct Rendering approach above is that the Store Queues are not used, and
+ therefore can be used for anything else.
+
+ \param data A pointer to the 32-byte payload.
+ The pointer must be aligned to 8 bytes.
+*/
+void pvr_send_to_ta(void *data);
+
/** @} */
/** \brief Submit a primitive of the given list type.
hooks/post-receive
--
A pseudo Operating System for the Dreamcast.
|
