diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakeres.c')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakeres.c | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakeres.c b/c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakeres.c deleted file mode 100644 index 51f03a070f..0000000000 --- a/c/src/lib/libbsp/powerpc/shared/bootloader/qemu_fakeres.c +++ /dev/null @@ -1,226 +0,0 @@ -#include <bsp/residual.h> -#include <stdint.h> - -/* Magic knowledge - qemu loads image here. - * However, we use the value from NVRAM if possible... - */ -#define KERNELBASE 0x01000000 - -/* When starting qemu make sure to give the correct - * amount of memory! - * - * NOTE: Code now supports reading the actual memory - * amount from NVRAM. The residual copy in RAM - * is fixed-up accordingly. - */ -#define MEM_MEGS 32 - -/* Mock up a minimal/fake residual; just enough to make the - * bootloader happy. - */ -struct fake_data { - unsigned long dat_len; - unsigned long res_off; - unsigned long cmd_off; - unsigned long cmd_len; - unsigned long img_adr; - RESIDUAL fake_residual; - char cmdline[1024]; -} fake_data = { -dat_len: sizeof(fake_data), -res_off: (unsigned long) &fake_data.fake_residual - -(unsigned long) &fake_data, -cmd_off: (unsigned long) &fake_data.cmdline - -(unsigned long) &fake_data, -cmd_len: sizeof(fake_data.cmdline), -img_adr: KERNELBASE, -fake_residual: -{ - ResidualLength: sizeof(RESIDUAL), - Version: 0, - Revision: 0, - EC: 0, - VitalProductData: { - FirmwareSupplier: QEMU, - ProcessorHz: 300000000, /* fantasy */ - ProcessorBusHz: 100000000, /* qemu timebase clock */ - TimeBaseDivisor:1*1000, - }, - MaxNumCpus: 1, - ActualNumCpus: 1, - Cpus: { - { - CpuType: 0x00040103, /* FIXME: fill from PVR */ - CpuNumber: 0, - CpuState: 0, - }, - }, - /* Memory */ - TotalMemory: 1024*1024*MEM_MEGS, - GoodMemory: 1024*1024*MEM_MEGS, - ActualNumMemSegs: 13, - Segs: { - { 0x2000, 0xFFF00, 0x00100 }, - { 0x0020, MEM_MEGS*0x100, 0x80000 - MEM_MEGS*0x100 }, - { 0x0008, 0x00800, 0x00168 }, - { 0x0004, 0x00000, 0x00005 }, - { 0x0001, 0x006F1, 0x0010F }, - { 0x0002, 0x006AD, 0x00044 }, - { 0x0010, 0x00005, 0x006A8 }, - { 0x0010, 0x00968, MEM_MEGS*0x100 - 0x00968 }, - { 0x0800, 0xC0000, 0x3F000 }, - { 0x0600, 0xBF800, 0x00800 }, - { 0x0500, 0x81000, 0x3E800 }, - { 0x0480, 0x80800, 0x00800 }, - { 0x0440, 0x80000, 0x00800 } - }, - ActualNumMemories: 0, - Memories: { - {0}, - }, - /* Devices */ - ActualNumDevices: 1, - Devices: { - { - DeviceId: { - BusId: PROCESSORDEVICE, - BaseType: BridgeController, - SubType: PCIBridge, - Interface: PCIBridgeIndirect, - }, - } - }, - DevicePnPHeap: {0} -}, -/* This is overwritten by command line passed by qemu. */ -cmdline: { - '-','-','n','e','2','k','-','i','r','q','=','9', - 0, -} -}; - -/* Read one byte from NVRAM */ -static inline uint8_t -nvram_rd(void) -{ -uint8_t rval = *(volatile uint8_t*)0x80000077; - asm volatile("eieio"); - return rval; -} - -/* Set NVRAM address pointer */ -static inline void -nvram_addr(uint16_t addr) -{ - *(volatile uint8_t*)0x80000074 = (addr & 0xff); - asm volatile("eieio"); - *(volatile uint8_t*)0x80000075 = ((addr>>8) & 0xff); - asm volatile("eieio"); -} - -/* Read a 32-bit (big-endian) work from NVRAM */ -static uint32_t -nvram_rdl_be(uint16_t addr) -{ -int i; -uint32_t rval = 0; - for ( i=0; i<sizeof(rval); i++ ) { - nvram_addr( addr + i ); - rval = (rval<<8) | nvram_rd(); - } - return rval; -} - - -/* !!! NOTE !!! - * - * We use a special hack to propagate command-line info to the bootloader. - * This is NOT PreP compliant (but who cares). - * We set R6 and R7 to point to the start/end of the command line string - * and hacked the bootloader so it uses R6/R7 (provided that the firmware - * is detected as 'QEMU'). - * - * (see bootloader/mm.c, bootloader/misc.c, bootloader/bootldr.h, -- boot_data.cmd_line[]) - */ -uint32_t -res_copy(void) -{ -struct fake_data *p; -uint32_t addr, cmdl, l, imga; -uint32_t mem_sz, pgs; -int i; -int have_nvram; - - /* Make sure we have a valid NVRAM -- just check for 'QEMU' at the - * beginning - */ - have_nvram = ( (('Q'<<24) | ('E'<<16) | ('M'<< 8) | ('U'<< 0)) == nvram_rdl_be( 0x0000 ) ); - - if ( !have_nvram ) { - /* reading NVRAM failed - fall back to using the static residual copy; - * this means no support for variable memory size or 'true' command line. - */ - return (uint32_t)&fake_data; - } - - /* Dilemma - we don't really know where to put the residual copy - * (original is in ROM and cannot be modified). - * We can't put it at the top of memory since the bootloader starts - * allocating memory from there, before saving the residual, that is. - * Too close to the final image might not work either because RTEMS - * zeroes its BSS *before* making its copies of the residual and commandline. - * - * For now we hope that appending to the kernel image works (and that - * the bootloader puts it somewhere safe). - */ - imga = nvram_rdl_be( 0x0038 ); - addr = imga + nvram_rdl_be( 0x003c ); - addr += 0x1f; - addr &= ~(0x1f); - - p = (struct fake_data *)addr; - - /* commandline + length from NVRAM */ - cmdl = nvram_rdl_be( 0x0040 ); - l = nvram_rdl_be( 0x0044 ); - - if ( l > 0 ) { - /* have a command-line; copy it into our local buffer */ - if ( l > sizeof( p->cmdline ) - 1 ) { - l = sizeof( p->cmdline ) - 1; - } - /* original may overlap our buffer; must safely move around */ - if ( p->cmdline < (char*)cmdl ) { - for ( i=0; i<l; i++ ) { - p->cmdline[i] = ((char*)cmdl)[i]; - } - } else { - for ( i=l-1; i>=0; i-- ) { - p->cmdline[i] = ((char*)cmdl)[i]; - } - } - } - p->cmdline[l] = 0; - /* Copy rest of residual */ - for ( i=0; i<sizeof(p->fake_residual); i++ ) - ((char*)&p->fake_residual)[i] = ((char*)&fake_data.fake_residual)[i]; - p->dat_len = fake_data.dat_len; - p->res_off = fake_data.res_off; - p->cmd_off = fake_data.cmd_off; - p->cmd_len = l+1; - p->img_adr = imga; - - /* Fix up memory in residual from NVRAM settings */ - - mem_sz = nvram_rdl_be( 0x0030 ); - pgs = mem_sz >> 12; - - p->fake_residual.TotalMemory = mem_sz; - p->fake_residual.GoodMemory = mem_sz; - - p->fake_residual.Segs[1].BasePage = pgs; - p->fake_residual.Segs[1].PageCount = 0x80000 - pgs; - p->fake_residual.Segs[7].PageCount = pgs - 0x00968; - - return (uint32_t)p; -} |