3rd-party/linux-kernel-module-cheat
1
0
Fork 0
mirror of https://github.com/cirosantilli/linux-kernel-module-cheat.git synced 2026-01-23 02:05:57 +01:00
Code Issues Releases Wiki Activity

baremetal: all examples working, all failures accounted for!

Browse Source 
SIMD&FP is now enabled in arm from bootloader.
This commit is contained in:
Ciro Santilli 六四事件 法轮功
2019-05-25 00:00:01 +00:00
parent 8825222579
commit add6eedb76
21 changed files with 181 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
baremetal/lib/aarch64.S
View File

@@ -2,15 +2,15 @@
.global lkmc_start
lkmc_start:
/* = NEON setup */
mov x1, #(0x3 << 20)
msr cpacr_el1, x1
isb
/* Load the vector table. */
ldr x0, =lkmc_vector_table
msr vbar_el1, x0
/* https://github.com/cirosantilli/linux-kernel-module-cheat#aarch64-baremetal-neon-setup */
mov x1, 0x3 << 20
msr cpacr_el1, x1
isb
/* Prepare the stack for main, mandatory for C code. */
ldr x0, =stack_top
mov sp, x0
@@ -30,8 +30,8 @@ LKMC_VECTOR_TABLE
/* Default trap handler. */
LKMC_WEAK(lkmc_vector_trap_handler)
ldr x0, =lkmc_vector_trap_handler_error
ldr x0, =lkmc_vector_trap_handler_error_message
bl puts
bl abort
lkmc_vector_trap_handler_error:
lkmc_vector_trap_handler_error_message:
.asciz "error: unexpected interrupt"

13
baremetal/lib/arm.S
View File

@@ -5,6 +5,19 @@ lkmc_start:
/* Prepare the stack for main, mandatory for C code. */
ldr sp, =stack_top
/* Enable floating point.
* Code copied from: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0409h/CHDEGGFF.html
* Without this, SIMD operations such as vmov raise an exception.
*/
mrc p15, 0, r0, c1, c0, 2 /* Read CPACR into r0 */
orr r0, r0, 3 << 20 /* OR in User and Privileged access for CP10 */
orr r0, r0, 3 << 22 /* OR in User and Privileged access for CP11 */
bic r0, r0, 3 << 30 /* Clear ASEDIS/D32DIS if set */
mcr p15, 0, r0, c1, c0, 2 /* Store new access permissions into CPACR */
isb /* Ensure side-effect of CPACR is visible */
mov r0, 1 << 30 /* Create value with FPEXC (bit 30) set in r0 */
vmsr fpexc, r0 /* Enable VFP and SIMD extensions */
/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
ldr r0, =lkmc_baremetal_on_exit_callback
bl on_exit