FreeCalypso > hg > fc-tourmaline
view src/cs/system/template/gsm_ds_amd8_compact.template @ 220:0ed36de51973
ABB semaphore protection overhaul
The ABB semaphone protection logic that came with TCS211 from TI
was broken in several ways:
* Some semaphore-protected functions were called from Application_Initialize()
context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with
NU_INVALID_SUSPEND in this context, but the return value wasn't checked,
and NU_Release_Semaphore() would be called unconditionally at the end.
The latter call would increment the semaphore count past 1, making the
semaphore no longer binary and thus no longer effective for resource
protection. The fix is to check the return value from NU_Obtain_Semaphore()
and skip the NU_Release_Semaphore() call if the semaphore wasn't properly
obtained.
* Some SPI hardware manipulation was being done before entering the semaphore-
protected critical section. The fix is to reorder the code: first obtain
the semaphore, then do everything else.
* In the corner case of L1/DSP recovery, l1_abb_power_on() would call some
non-semaphore-protected ABB & SPI init functions. The fix is to skip those
calls in the case of recovery.
* A few additional corner cases existed, all of which are fixed by making
ABB semaphore protection 100% consistent for all ABB functions and code paths.
There is still one remaining problem of priority inversion: suppose a low-
priority task calls an ABB function, and some medium-priority task just happens
to preempt right in the middle of that semaphore-protected ABB operation. Then
the high-priority SPI task is locked out for a non-deterministic time until
that medium-priority task finishes its work and goes back to sleep. This
priority inversion problem remains outstanding for now.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Mon, 26 Apr 2021 20:55:25 +0000 |
| parents | 4e78acac3d88 |
| children |
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/* * Integrated Protocol Stack Linker command file (all components) * * Target : ARM * * Copyright (c) Texas Instruments 2002, Condat 2002 * */ -c /* Autoinitialize variables at runtime */ /*********************************/ /* SPECIFY THE SYSTEM MEMORY MAP */ /*********************************/ MEMORY { /* CS0: Flash 8 Mbytes ****************************************************/ /* Interrupt Vectors Table */ I_MEM (RXI) : org = 0x00000000 len = 0x00000100 /* Boot Sector */ B_MEM (RXI) : org = 0x00000100 len = 0x00001f00 /* Magic Word for Calypso Boot ROM */ MWC_MEM (RXI) : org = 0x00002000 len = 0x00000004 fill = 0x0000001 /* Program Memory */ P_MEM1 (RXI) : org = 0x00004000 len = 0x00000700 P_MEM2 (RXI) : org = 0x00004700 len = 0x00000004 P_MEM3 (RXI) : org = 0x00004704 len = 0x00400000 /* FFS Area */ FFS_MEM (RX) : org = 0x01800000 len = 0x00200000 /**************************************************************************/ /* CS1: External SRAM 1 Mbytes ********************************************/ /* Data Memory */ /* * FreeCalypso: we try to support several different Leonardo board * variants with different flash and XRAM sizes. In this template * we are going to define two XRAM regions of 1 MiB each. */ D_MEM1 (RW) : org = 0x01000000 len = 0x00100000 D_MEM2 (RW) : org = 0x01100000 len = 0x00100000 /**************************************************************************/ /* CS6: Calypso Internal SRAM 512 kbytes **********************************/ /* Code & Variables Memory */ S_MEM (RXW) : org = 0x00800000 len = 0x00080000 /**************************************************************************/ } /***********************************************/ /* SPECIFY THE SECTIONS ALLOCATION INTO MEMORY */ /***********************************************/ /* * Since the bootloader directly calls the INT_Initialize() routine located * in int.s, this int.s code must always be mapped at the same address * (usually in the second flash sector). Its length is about 0x500 bytes. * Then comes the code that need to be loaded into the internal RAM. */ SECTIONS { .intvecs : {} > I_MEM /* Interrupt Vectors Table */ .monitor : > B_MEM /* Monitor Constants & Code */ { $(CONST_BOOT_LIB) } .inttext : {} > P_MEM1 /* int.s Code */ .bss_dar : > D_MEM1 /* DAR SWE Variables */ { $(BSS_DAR_LIB) } /* * The .bss section should not be split to ensure it is initialized to 0 * each time the SW is reset. So the whole .bss is mapped either in D_MEM1 * or in D_MEM2. */ .bss : > D_MEM1 | D_MEM2 /* Global & Static Variables */ { $(BSS_BOOT_LIB) } /* * All .bss sections, which must be mapped in internal RAM must be * grouped in order to initialized the corresponding memory to 0. * This initialization is done in int.s file before calling the Nucleus * routine. */ GROUP { S_D_Mem /* Label of start address of .bss section in Int. RAM */ .DintMem { /* * .bss sections of the application */ $(BSS_LIBS) } API_HISR_stack : {} E_D_Mem /* Label of end address of .bss section in Int. RAM */ } > S_MEM /* * .text and .const sections which must be mapped in internal RAM. */ .ldfl : {} > P_MEM2 /* Used to know the start load address */ GROUP load = P_MEM3, run = S_MEM { S_P_Mem /* Label of start address of .text & .const sections in Int. RAM */ .PIntMem { /* * .text and .const sections of the application. * * The .veneer sections correspond exactly to .text:v&n sections * implementing the veneer functions. The .text:v$n -> .veneer * translation is performed by PTOOL software when PTOOL_OPTIONS * environement variable is set to veneer_section. */ $(CONST_LIBS) } E_P_Mem /* Label of end address of .text and .const sections in Int. RAM */ } /* * The rest of the code is mapped in flash, however the trampolines * load address should be consistent with .text. */ COMMENT2START `trampolines load = P_MEM3, run = S_MEM COMMENT2END .text : {} > P_MEM3 /* Code */ /* * The rest of the constants is mapped in flash. * The .cinit section should not be split. */ .cinit : {} > P_MEM3 /* Initialization Tables */ .const : {} > P_MEM3 /* Constant Data */ KadaAPI : {} > P_MEM3 /* ROMized CLDC */ .javastack: {} >> D_MEM1 | D_MEM2 /* Java stack */ .stackandheap : > D_MEM1 /* System Stacks, etc... */ { /* Leave 20 32bit words for register pushes. */ . = align(8); . += 20 * 4; /* Stack for abort and/or undefined modes. */ exception_stack = .; /* Leave 38 32bit words for state saving on exceptions. */ _xdump_buffer = .; . += 38 * 4; . = align(8); /* Beginning of stacks and heap area - 2.75 kbytes (int.s) */ stack_segment = .; . += 0xB00; } .data : {} > D_MEM1 /* Initialized Data */ .sysmem : {} > D_MEM1 /* Dynamic Memory Allocation Area */ }
