Change mtime frequency from 1 ms to 1 μs

Author: object-Object

README.md

@@ -43,7 +43,7 @@ Addresses `0xf0000000` - `0xffffffff` are reserved for system purposes such as M
 
 ### Machine Timers
 
-The `mtime` and `mtimecmp` registers are mapped to `0xf0000000` and `0xf0000008` respectively, and have a period of 1 ms. The timer registers are not accessible to privilege modes lower than M-mode.
+The `mtime` and `mtimecmp` registers are mapped to `0xf0000000` and `0xf0000008` respectively, and have a period of 1 μs. The timer registers are not accessible to privilege modes lower than M-mode.
 
 ### UART
 
@@ -151,7 +151,7 @@ The `[m]cycle[h]` counter is incremented at the start of each worker's tick, jus
 
 ### `time`
 
-The `[m]time[h]` counter is based on the `@time` value in Mindustry. It has a period of 1 ms, and is incremented once per tick by the controller based on the time delta since the previous tick.
+The `[m]time[h]` counter is based on the `@time` value in Mindustry. It has a period of 1 μs, and is incremented once per tick by the controller based on the time delta since the previous tick.
 
 ## riscv-arch-test
 

coremark/mlogv32/core_portme.c

@@ -57,7 +57,7 @@ barebones_clock()
    does not occur. If there are issues with the return value overflowing,
    increase this value.
         */
-#define CLOCKS_PER_SEC             1000
+#define CLOCKS_PER_SEC             1000000
 #define GETMYTIME(_t)              (*_t = barebones_clock())
 #define MYTIMEDIFF(fin, ini)       ((fin) - (ini))
 #define TIMER_RES_DIVIDER          1

linux/buildroot/board/mlogv32/dts/mlogv32.dtb

@@ -41,7 +41,7 @@
     cpus {
         #address-cells = <1>;
         #size-cells = <0>;
-        timebase-frequency = <1000>;
+        timebase-frequency = <1000000>;
 
         cpu@0 {
             device_type = "cpu";

linux/buildroot/board/mlogv32/dts/mlogv32.dts

@@ -19,7 +19,7 @@
 #include <sbi_utils/serial/xlnx_uartlite.h>
 #include <sbi_utils/timer/aclint_mtimer.h>
 
-#define MLOGV32_MTIME_FREQ		1000
+#define MLOGV32_MTIME_FREQ		1000000
 #define MLOGV32_MTIME_ADDR		0xf0000000
 #define MLOGV32_MTIME_SIZE		0x8
 #define MLOGV32_MTIMECMP_ADDR		0xf0000008

linux/buildroot/opensbi/platform/mlogv32/platform.c

@@ -25,7 +25,7 @@ fn main() -> ! {
 
         let mut timer = TIMER.borrow_ref_mut(cs);
         timer.write_mtime(0);
-        timer.write_mtimecmp(1000);
+        timer.write_mtimecmp(1_000_000);
     });
 
     unsafe {
@@ -43,7 +43,7 @@ fn machine_timer() {
     critical_section::with(|cs| {
         let mut timer = TIMER.borrow_ref_mut(cs);
         let mtime = timer.read_mtime();
-        timer.write_mtimecmp(mtime + 1000);
+        timer.write_mtimecmp(mtime + 1_000_000);
 
         let mut uart0 = UART0.borrow_ref_mut(cs);
         let uart0 = uart0.as_mut().unwrap();

rust/examples/timer/src/main.rs

@@ -297,6 +297,7 @@ end_breakpoint:
     # TODO: handle mtimeh overflow
 
     op sub delta_ms @time last_mtime_update
+    op mul delta_ms delta_ms 1000 # ms -> μs
 
     op add csr_mtime csr_mtime delta_ms
     op floor csr_mtime csr_mtime