mirror of
https://github.com/UpsilonNumworks/Upsilon.git
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253 lines
8.0 KiB
C++
253 lines
8.0 KiB
C++
#include <bootloader/slots/slot_exam_mode.h>
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#include <assert.h>
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#include <ion.h>
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#include <ion/src/device/shared/drivers/flash.h>
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namespace Bootloader {
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namespace ExamMode {
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/* The exam mode is written in flash so that it is resilient to resets.
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* We erase the dedicated flash sector (all bits written to 1) and, upon
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* deactivating or activating standard, nosym or Dutch exam mode we write one, two or tree
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* bits to 0. To determine in which exam mode we are, we count the number of
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* leading 0 bits. If it is equal to:
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* - 0[3]: the exam mode is off;
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* - 1[3]: the standard exam mode is activated;
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* - 2[3]: the NoSym exam mode is activated;
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* - 3[3]: the Dutch exam mode is activated;
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* - 4[3]: the NoSymNoText exam mode is activated. */
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/* significantExamModeAddress returns the first uint32_t * in the exam mode
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* flash sector that does not point to 0. If this flash sector has only 0s or
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* if it has only one 1, it is erased (to 1) and significantExamModeAddress
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* returns the start of the sector. */
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constexpr static size_t numberOfBitsInByte = 8;
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// if i = 0b000011101, firstOneBitInByte(i) returns 5
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size_t numberOfBitsAfterLeadingZeroes(int i) {
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int minShift = 0;
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int maxShift = numberOfBitsInByte;
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while (maxShift > minShift+1) {
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int shift = (minShift + maxShift)/2;
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int shifted = i >> shift;
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if (shifted == 0) {
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maxShift = shift;
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} else {
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minShift = shift;
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}
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}
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return maxShift;
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}
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uint8_t SlotsExamMode::FetchSlotExamMode(const char * version, const char * Slot) {
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// Get start and end from version and slot
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uint32_t start = 0;
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uint32_t end = 0;
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if (Slot == "A") {
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// If version under 16 get old addresses
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if (version[0] < '1' || (version[0] == '1' && version[1] < '6')) {
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start = getSlotAStartExamAddress(0);
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end = getSlotAEndExamAddress(0);
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}
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// Else versions before 22
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else if ((version[0] == '2' && version[1] < '2') || (version[0] == '1')) {
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start = getSlotAStartExamAddress(1);
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end = getSlotAEndExamAddress(1);
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}
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// Else Epsilon 22 +
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else {
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start = getSlotAStartExamAddress(2);
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end = getSlotAEndExamAddress(2);
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}
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}
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else if (Slot == "B") {
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// If version under 16 get old
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if (version[0] < '1' || (version[0] == '1' && version[1] < '6')) {
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start = getSlotBStartExamAddress(0);
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end = getSlotBEndExamAddress(0);
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}
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// Else versions before 22
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else if ((version[0] == '2' && version[1] < '2') || (version[0] == '1')) {
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start = getSlotBStartExamAddress(1);
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end = getSlotBEndExamAddress(1);
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}
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// Else Epsilon 22 +
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else {
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start = getSlotBStartExamAddress(2);
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end = getSlotBEndExamAddress(2);
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}
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} else if (Slot == "Khi") {
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// We directly get the address of the Khi exam mode without checking the
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// version, because on Khi, version is KhiCAS version, not the OS version
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start = getSlotKhiStartExamAddress();
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end = getSlotKhiEndExamAddress();
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}
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if (strcmp("15.9.0", version) >= 0) {
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return examFetch15(start, end);
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} else if (strcmp("16.9.0", version) > 0) {
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return examFetch16(start, end);
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} else if (strcmp("19.0.0", version) > 0) {
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return examFetch1718(start, end);
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} else {
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return examFetch19(start, end);
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}
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}
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uint8_t SlotsExamMode::FetchSlotAExamMode(const char* version) {
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return FetchSlotExamMode(version, "A");
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}
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uint8_t SlotsExamMode::FetchSlotBExamMode(const char* version) {
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return FetchSlotExamMode(version, "B");
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}
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uint8_t SlotsExamMode::FetchSlotKhiExamMode(const char* version) {
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return FetchSlotExamMode(version, "Khi");
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}
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uint8_t SlotsExamMode::examFetch15(uint32_t start, uint32_t end) {
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uint32_t * persitence_start_32 = (uint32_t *)start;
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uint32_t * persitence_end_32 = (uint32_t *)end;
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assert((persitence_end_32 - persitence_start_32) % 4 == 0);
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while (persitence_start_32 < persitence_end_32 && *persitence_start_32 == 0x0) {
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// Scan by groups of 32 bits to reach first non-zero bit
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persitence_start_32++;
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}
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uint8_t * persitence_start_8 = (uint8_t *)persitence_start_32;
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uint8_t * persitence_end_8 = (uint8_t *)persitence_end_32;
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while (persitence_start_8 < persitence_end_8 && *persitence_start_8 == 0x0) {
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// Scan by groups of 8 bits to reach first non-zero bit
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persitence_start_8++;
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}
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if (persitence_start_8 == persitence_end_8
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// we can't toggle from 0[3] to 2[3] when there is only one 1 bit in the whole sector
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|| (persitence_start_8 + 1 == persitence_end_8 && *persitence_start_8 == 1)) {
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assert(Ion::Device::Flash::SectorAtAddress(start) >= 0);
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Ion::Device::Flash::EraseSector(start);
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uint32_t nbOfZerosBefore = (((uint8_t*)start - (uint8_t*)start) * numberOfBitsInByte) % 4;
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// Count the number of 0[3] at reading address
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size_t numberOfLeading0 = (numberOfBitsInByte - numberOfBitsAfterLeadingZeroes(*(uint8_t*)start)) % 4;
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return (nbOfZerosBefore + numberOfLeading0) % 4;
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}
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uint32_t nbOfZerosBefore = ((persitence_start_8 - (uint8_t*)start) * numberOfBitsInByte) % 4;
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// Count the number of 0[3] at reading address
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size_t numberOfLeading0 = (numberOfBitsInByte - numberOfBitsAfterLeadingZeroes(*persitence_start_8)) % 4;
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return (nbOfZerosBefore + numberOfLeading0) % 4;
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}
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uint8_t SlotsExamMode::examFetch16(uint32_t start, uint32_t end) {
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uint8_t* persitence_start_8 = (uint8_t*)start;
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uint8_t* persitence_end_8 = (uint8_t*)end;
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while (persitence_start_8 + 1 <= persitence_end_8 && (*persitence_start_8 != 0xFF)) {
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// Scan by groups of 8 bits to reach first non-zero bit
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persitence_start_8++;
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}
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return *(persitence_start_8 - 1);
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}
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uint8_t SlotsExamMode::examFetch1718(uint32_t start, uint32_t end) {
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uint8_t* persitence_start_8 = (uint8_t*)start;
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uint8_t* persitence_end_8 = (uint8_t*)end;
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while (persitence_start_8 + 1 <= persitence_end_8 && (*persitence_start_8 != 0xFF)) {
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// Scan by groups of 8 bits to reach first non-zero bit
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persitence_start_8++;
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}
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return *(persitence_start_8 - 2);
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}
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uint8_t SlotsExamMode::examFetch19(uint32_t start, uint32_t end) {
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uint16_t* start16 = (uint16_t*)start;
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uint16_t* end16 = (uint16_t*)end;
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for (uint16_t* i = end16 - 2; i > start16; i--) {
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if (*i != 0xFFFF) {
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uint8_t highByte = *i >> 8;
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uint8_t lowByte = *i & 0xFF;
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if (highByte > lowByte) {
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return highByte;
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}
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else {
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return lowByte;
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}
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}
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}
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}
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uint32_t SlotsExamMode::getSlotAStartExamAddress(int ExamVersion) {
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if (ExamVersion == 0) {
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return SlotAExamModeBufferStartBefore16;
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}
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if (ExamVersion == 1) {
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return SlotAExamModeBufferStartEpsilon16;
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}
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if (ExamVersion == 2) {
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return SlotAExamModeBufferStartEpsilon22;
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}
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assert(false);
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// Should not happen
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return SlotAExamModeBufferStartEpsilon22;
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}
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uint32_t SlotsExamMode::getSlotAEndExamAddress(int ExamVersion) {
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if (ExamVersion == 0) {
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return SlotAExamModeBufferEndBefore16;
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}
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if (ExamVersion == 1) {
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return SlotAExamModeBufferEndEpsilon16;
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}
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if (ExamVersion == 2) {
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return SlotAExamModeBufferEndEpsilon22;
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}
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assert(false);
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// Should not happen
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return SlotAExamModeBufferEndEpsilon22;
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}
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uint32_t SlotsExamMode::getSlotBStartExamAddress(int ExamVersion) {
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if (ExamVersion == 0) {
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return SlotBExamModeBufferStartBeforeEpsilon16;
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}
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if (ExamVersion == 1) {
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return SlotBExamModeBufferStartEpsilon16;
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}
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if (ExamVersion == 2) {
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return SlotBExamModeBufferStartEpsilon22;
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}
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assert(false);
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// Should not happen
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return SlotBExamModeBufferStartEpsilon22;
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}
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uint32_t SlotsExamMode::getSlotBEndExamAddress(int ExamVersion) {
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if (ExamVersion == 0) {
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return SlotBExamModeBufferEndBeforeEpsilon16;
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}
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if (ExamVersion == 1) {
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return SlotBExamModeBufferEndEpsilon16;
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}
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if (ExamVersion == 2) {
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return SlotBExamModeBufferEndEpsilon22;
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}
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assert(false);
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// Should not happen
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return SlotBExamModeBufferEndEpsilon22;
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}
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uint32_t SlotsExamMode::getSlotKhiStartExamAddress() {
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return SlotKhiExamModeBufferStart;
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}
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uint32_t SlotsExamMode::getSlotKhiEndExamAddress() {
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return SlotKhiExamModeBufferEnd;
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}
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}
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}
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