From 0b33e0b427641f22b47afb230dc8f623d743971c Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Fri, 1 Mar 2019 11:37:32 -0500
Subject: [PATCH] atsamd: Implement custom memory allocation functions

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---
 src/atsamd/Makefile |  3 +--
 src/atsamd/main.c   | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/atsamd/Makefile b/src/atsamd/Makefile
index 5b279903..6db2e177 100644
--- a/src/atsamd/Makefile
+++ b/src/atsamd/Makefile
@@ -17,8 +17,7 @@ CFLAGS += $(CFLAGS-y) -D__$(MCU)__ -mthumb -Ilib/cmsis-core
 CFLAGS_klipper.elf += -T $(OUT)samd.ld --specs=nano.specs --specs=nosys.specs
 
 # Add source files
-src-y += atsamd/main.c atsamd/gpio.c
-src-y += generic/crc16_ccitt.c generic/alloc.c generic/armcm_irq.c
+src-y += atsamd/main.c atsamd/gpio.c generic/crc16_ccitt.c generic/armcm_irq.c
 src-$(CONFIG_USBSERIAL) += atsamd/usbserial.c generic/usb_cdc.c
 src-$(CONFIG_SERIAL) += atsamd/serial.c generic/serial_irq.c
 src-$(CONFIG_HAVE_GPIO_ADC) += atsamd/adc.c
diff --git a/src/atsamd/main.c b/src/atsamd/main.c
index 9233662f..5a5a374d 100644
--- a/src/atsamd/main.c
+++ b/src/atsamd/main.c
@@ -10,6 +10,22 @@
 
 DECL_CONSTANT(MCU, CONFIG_MCU);
 
+// Return the start of memory available for dynamic allocations
+void *
+dynmem_start(void)
+{
+    extern uint32_t _ezero;
+    return &_ezero;
+}
+
+// Return the end of memory available for dynamic allocations
+void *
+dynmem_end(void)
+{
+    extern uint32_t _sstack;
+    return &_sstack;
+}
+
 void
 command_reset(uint32_t *args)
 {