From f86dab5ff3e9c35e9e68b798b5c4faa08d390085 Mon Sep 17 00:00:00 2001
From: Per Lindgren <per.lindgren@ltu.se>
Date: Fri, 21 Jan 2022 21:49:45 +0100
Subject: Added support for SRP based scheduling for armv6m

---
 macros/src/codegen.rs                  |  2 +-
 macros/src/codegen/assertions.rs       | 32 ++++++++++++++++++++++++++++++--
 macros/src/codegen/shared_resources.rs | 33 +++++++++++++++++++++++++++++++++
 macros/src/codegen/util.rs             |  1 +
 4 files changed, 65 insertions(+), 3 deletions(-)

(limited to 'macros/src')

diff --git a/macros/src/codegen.rs b/macros/src/codegen.rs
index f5cae34a..01be1d57 100644
--- a/macros/src/codegen.rs
+++ b/macros/src/codegen.rs
@@ -28,7 +28,7 @@ pub fn app(app: &App, analysis: &Analysis, extra: &Extra) -> TokenStream2 {
     let mut user = vec![];
 
     // Generate the `main` function
-    let assertion_stmts = assertions::codegen(app, analysis);
+    let assertion_stmts = assertions::codegen(app, analysis, extra);
 
     let pre_init_stmts = pre_init::codegen(app, analysis, extra);
 
diff --git a/macros/src/codegen/assertions.rs b/macros/src/codegen/assertions.rs
index a8a4491b..36ab0364 100644
--- a/macros/src/codegen/assertions.rs
+++ b/macros/src/codegen/assertions.rs
@@ -1,11 +1,11 @@
 use proc_macro2::TokenStream as TokenStream2;
 use quote::quote;
 
-use crate::analyze::Analysis;
+use crate::{analyze::Analysis, check::Extra, codegen::util};
 use rtic_syntax::ast::App;
 
 /// Generates compile-time assertions that check that types implement the `Send` / `Sync` traits
-pub fn codegen(app: &App, analysis: &Analysis) -> Vec<TokenStream2> {
+pub fn codegen(app: &App, analysis: &Analysis, extra: &Extra) -> Vec<TokenStream2> {
     let mut stmts = vec![];
 
     for ty in &analysis.send_types {
@@ -21,5 +21,33 @@ pub fn codegen(app: &App, analysis: &Analysis) -> Vec<TokenStream2> {
         stmts.push(quote!(rtic::export::assert_monotonic::<#ty>();));
     }
 
+    let device = &extra.device;
+    let arm_v6_checks: Vec<_> = app
+        .hardware_tasks
+        .iter()
+        .filter_map(|(_, task)| {
+            if !util::is_exception(&task.args.binds) {
+                let interrupt_name = &task.args.binds;
+                Some(quote!(assert!((#device::Interrupt::#interrupt_name as u32) < 32);))
+            } else {
+                None
+            }
+        })
+        .collect();
+
+    let const_check = quote! {
+        const _CONST_CHECK: () = {
+            if rtic::export::is_armv6() {
+                #(#arm_v6_checks)*
+            } else {
+                // TODO: Add armv7 checks here
+            }
+        };
+
+        let _ = _CONST_CHECK;
+    };
+
+    stmts.push(const_check);
+
     stmts
 }
diff --git a/macros/src/codegen/shared_resources.rs b/macros/src/codegen/shared_resources.rs
index 9e45cff9..a016e453 100644
--- a/macros/src/codegen/shared_resources.rs
+++ b/macros/src/codegen/shared_resources.rs
@@ -105,5 +105,38 @@ pub fn codegen(
         })
     };
 
+    // Computing mapping of used interrupts to masks
+    let interrupt_ids = analysis.interrupts.iter().map(|(p, (id, _))| (p, id));
+
+    use std::collections::HashMap;
+    let mut masks: HashMap<u8, _> = std::collections::HashMap::new();
+    let device = &extra.device;
+
+    for p in 0..3 {
+        masks.insert(p, quote!(0));
+    }
+
+    for (&priority, name) in interrupt_ids.chain(app.hardware_tasks.values().flat_map(|task| {
+        if !util::is_exception(&task.args.binds) {
+            Some((&task.args.priority, &task.args.binds))
+        } else {
+            // TODO: exceptions not implemented
+            None
+        }
+    })) {
+        let name = quote!(#device::Interrupt::#name as u32);
+        if let Some(v) = masks.get_mut(&(priority - 1)) {
+            *v = quote!(#v | 1 << #name);
+        };
+    }
+
+    let mut mask_arr: Vec<(_, _)> = masks.iter().collect();
+    mask_arr.sort_by_key(|(k, _v)| *k);
+    let mask_arr: Vec<_> = mask_arr.iter().map(|(_, v)| v).collect();
+
+    mod_app.push(quote!(
+        const MASKS: [u32; 3] = [#(#mask_arr),*];
+    ));
+
     (mod_app, mod_resources)
 }
diff --git a/macros/src/codegen/util.rs b/macros/src/codegen/util.rs
index 6a07732c..4a29754b 100644
--- a/macros/src/codegen/util.rs
+++ b/macros/src/codegen/util.rs
@@ -52,6 +52,7 @@ pub fn impl_mutex(
                         #priority,
                         CEILING,
                         #device::NVIC_PRIO_BITS,
+                        &MASKS,
                         f,
                     )
                 }
-- 
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