commit d0b6ad16c6db0d0d47f081de34eb97db9eb84d66
from: Aleksey Ryndin <continue@to.any-key.press>
date: Wed Oct 11 16:44:27 2023 UTC

Append capsule/squat/reports/0.0.2.gmi (WiP)

commit - d95db136134b6ff0cfaf04ae5de2c72a53825e8d
commit + d0b6ad16c6db0d0d47f081de34eb97db9eb84d66
blob - 193aa5aa23a417fd236f419a52162b54fca8d922
blob + 4e96ba7189e5c7caa0583c2395209fcfba2949a5
--- capsule/squat/reports/0.0.2.gmi
+++ capsule/squat/reports/0.0.2.gmi
@@ -75,3 +75,40 @@ aarch64-linux-gnu-gcc -Wp,-MD,spl/arch/arm/cpu/armv8/.
 ```
 aarch64-linux-gnu-objdump -d spl/u-boot-spl | less
 ```
+
+После пары безсмысленных (после применения препроцессора) переходов управление получает следующий кусок кода:
+```
+    /*
+     * Could be EL3/EL2/EL1, Initial State:
+     * Little Endian, MMU Disabled, i/dCache Disabled
+     */
+    switch_el x1, 3f, 2f, 1f
+3:  set_vbar vbar_el3, x0
+    mrs x0, scr_el3
+    orr x0, x0, #0xf            /* SCR_EL3.NS|IRQ|FIQ|EA */
+    msr scr_el3, x0
+    msr cptr_el3, xzr           /* Enable FP/SIMD */
+#ifdef COUNTER_FREQUENCY
+    ldr x0, =COUNTER_FREQUENCY
+    msr cntfrq_el0, x0          /* Initialize CNTFRQ */
+#endif
+    b   0f
+2:  set_vbar    vbar_el2, x0
+    mov x0, #0x33ff
+    msr cptr_el2, x0            /* Enable FP/SIMD */
+    b   0f
+1:  set_vbar    vbar_el1, x0
+    mov x0, #3 << 20
+    msr cpacr_el1, x0           /* Enable FP/SIMD */
+0:
+    isb
+```
+
+Тут макрос set_vbar разворачивается в пустышку.
+
+А код инициализации CNTFRQ выполняется:
+=> https://developer.arm.com/documentation/ddi0601/2023-06/AArch64-Registers/CNTFRQ-EL0--Counter-timer-Frequency-Register
+> Bits [31:0]
+> Clock frequency. Indicates the system counter clock frequency, in Hz.
+
+