firmware for my Touchscreen E-Paper Input Module for Framework Laptop 16
initial syscall implementation
+90
-4
+1
eepy-sys/src/lib.rs
+1
eepy-sys/src/lib.rs
+24
eepy-sys/src/syscall/mod.rs
+24
eepy-sys/src/syscall/mod.rs
···
1
+
/// Perform a raw system call.
2
+
#[macro_export]
3
+
macro_rules! syscall {
4
+
(
5
+
$syscall_num:expr,
6
+
$( out $r0out:ident )? $( in $r0in:expr )?,
7
+
$( out $r1out:ident )? $( in $r1in:expr )?,
8
+
$( out $r2out:ident )? $( in $r2in:expr )?,
9
+
$( out $r3out:ident )? $( in $r3in:expr )?,
10
+
) => {
11
+
asm!(
12
+
"svc #{syscall_num}",
13
+
$( in("r0") $r0in, )?
14
+
$( lateout("r0") $r0out, )?
15
+
$( in("r1") $r1in, )?
16
+
$( lateout("r1") $r1out, )?
17
+
$( in("r2") $r2in, )?
18
+
$( lateout("r2") $r2out, )?
19
+
$( in("r3") $r3in, )?
20
+
$( lateout("r3") $r3out, )?
21
+
syscall_num = const $syscall_num,
22
+
);
23
+
}
24
+
}
+19
-1
eepy/src/main.rs
+19
-1
eepy/src/main.rs
···
5
5
mod gui;
6
6
mod serial;
7
7
mod ringbuffer;
8
+
mod syscall;
8
9
10
+
use core::arch::asm;
9
11
#[allow(unused_imports)]
10
12
use panic_probe as _;
11
13
#[allow(unused_imports)]
···
37
39
use fw16_epd_bsp::pac::I2C0;
38
40
use fw16_epd_bsp::pac::interrupt;
39
41
use eepy_gui::draw_target::EpdDrawTarget;
40
-
use eepy_sys::{Event, RefreshBlockMode, SafeOption, TouchEvent, TouchEventType};
42
+
use eepy_sys::{syscall as do_syscall, Event, RefreshBlockMode, SafeOption, TouchEvent, TouchEventType};
41
43
use tp370pgh01::rp2040::{Rp2040PervasiveSpiDelays, IoPin};
42
44
use tp370pgh01::{Tp370pgh01, IMAGE_BYTES};
43
45
use crate::ringbuffer::RingBuffer;
···
325
327
program.entry()(&pft);
326
328
}
327
329
}*/
330
+
331
+
// Test syscall
332
+
unsafe {
333
+
let mut r0: usize;
334
+
let mut r1: usize;
335
+
let mut r2: usize;
336
+
let mut r3: usize;
337
+
do_syscall!(
338
+
31,
339
+
out r0 in 0,
340
+
out r1 in 1,
341
+
out r2 in 2,
342
+
out r3 in 3,
343
+
);
344
+
debug!("{} {} {} {}", r0, r1, r2, r3);
345
+
}
328
346
329
347
let draw_target = EpdDrawTarget::new(write_image, refresh);
330
348
gui::gui_main(draw_target);
+28
eepy/src/syscall.rs
+28
eepy/src/syscall.rs
···
1
+
use core::arch::{asm, global_asm};
2
+
use cortex_m_rt::exception;
3
+
use defmt::debug;
4
+
5
+
global_asm!(include_str!("syscall.s"));
6
+
7
+
/// Main syscall (SVC) handler.
8
+
///
9
+
/// This function is called by the assembly trampoline code in `syscall.s`.
10
+
///
11
+
/// `sp` contains the caller's stack pointer value (taken from either MSP or PSP depending on which
12
+
/// stack was active). This is where the register values are pushed when the exception is triggered,
13
+
/// so this is where we need to read/write to interface with the caller.
14
+
/// This stack location contains (in order): r0, r1, r2, r3, r12, lr, pc, xPSR.
15
+
/// The pc value from the stack can be used to extract the literal operand from the SVC instruction
16
+
/// which triggered the syscall.
17
+
#[no_mangle]
18
+
extern "C" fn syscall(sp: *mut usize) {
19
+
// Stack contains R0, R1, R2, R3, R12, LR, ReturnAddress, xPSR
20
+
let stack_values = unsafe { core::slice::from_raw_parts_mut(sp, 8) };
21
+
let svc_operand = unsafe { (stack_values[6] as *const u8).sub(2).read() };
22
+
debug!("{:x}", svc_operand);
23
+
24
+
// Increase the value of R0-R3 by 1
25
+
for i in 0..4 {
26
+
stack_values[i] += 1;
27
+
}
28
+
}
+15
eepy/src/syscall.s
+15
eepy/src/syscall.s
+1
-1
fw16-epd-gui/src/element/mod.rs
eepy-gui/src/element/mod.rs
+1
-1
fw16-epd-gui/src/element/mod.rs
eepy-gui/src/element/mod.rs
···
6
6
use embedded_graphics::pixelcolor::BinaryColor;
7
7
use embedded_graphics::prelude::*;
8
8
use embedded_graphics::primitives::{PrimitiveStyle, PrimitiveStyleBuilder, Rectangle};
9
-
use fw16_epd_program_interface::Event;
9
+
use eepy_sys::Event;
10
10
use tp370pgh01::{DIM_X, DIM_Y};
11
11
use crate::draw_target::EpdDrawTarget;
12
12
+1
-1
fw16-epd-gui/src/element/slider.rs
eepy-gui/src/element/slider.rs
+1
-1
fw16-epd-gui/src/element/slider.rs
eepy-gui/src/element/slider.rs
···
2
2
use embedded_graphics::geometry::Point;
3
3
use embedded_graphics::pixelcolor::BinaryColor;
4
4
use embedded_graphics::primitives::{Circle, Line, PrimitiveStyle, Rectangle};
5
-
use fw16_epd_program_interface::{Event, TouchEventType};
5
+
use eepy_sys::{Event, TouchEventType};
6
6
use crate::draw_target::EpdDrawTarget;
7
7
use crate::element::{Gui, DEFAULT_PRIMITIVE_STYLE};
8
8