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MPC106: allocate RAM after software setup.

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Software will setup MPC106 internal registers and
finally set MCCR1[MEMGO] flag. This is the right time
for initializing physical RAM.
This commit is contained in:
Maxim Poliakovski 2019-10-07 03:21:01 +02:00
parent 01c38b7348
commit 198b918a3c
4 changed files with 46 additions and 2 deletions
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1
devices/mmiodevice.h
View File

@ -6,6 +6,7 @@
#define READ_WORD_BE(addr) ((addr)[0] << 16) | (addr)[1]
#define READ_DWORD_BE(addr) ((addr)[0] << 24) | ((addr)[1] << 16) | ((addr)[2] << 8) | (addr)[3]
#define READ_DWORD_LE(addr) ((addr)[3] << 24) | ((addr)[2] << 16) | ((addr)[1] << 8) | (addr)[0]
/** Abstract class representing a simple, memory-mapped I/O device */
class MMIODevice {

42
devices/mpc106.cpp
View File

@ -160,6 +160,13 @@ void MPC106::pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size)
std::cout << "MPC106 read error: invalid size parameter " << size
<< std::endl;
}
if (this->my_pci_cfg_hdr[0xF2] & 8) {
#ifdef MPC106_DEBUG
std::cout << "MPC106: MCCR1[MEMGO] was set! " << std::endl;
#endif
setup_ram();
}
}
bool MPC106::pci_register_device(int dev_num, PCIDevice *dev_instance)
@ -179,3 +186,38 @@ bool MPC106::pci_register_mmio_region(uint32_t start_addr, uint32_t size, PCIDev
// FIXME: add sanity checks!
return this->add_mmio_region(start_addr, size, obj);
}
void MPC106::setup_ram()
{
uint32_t mem_start, mem_end, ext_mem_start, ext_mem_end, bank_start, bank_end;
uint32_t ram_size = 0;
uint8_t bank_en = this->my_pci_cfg_hdr[0xA0];
for (int bank = 0; bank < 8; bank++) {
if (bank_en & (1 << bank)) {
if (bank < 4) {
mem_start = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x80]);
ext_mem_start = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x88]);
mem_end = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x90]);
ext_mem_end = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x98]);
} else {
mem_start = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x84]);
ext_mem_start = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x8C]);
mem_end = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x94]);
ext_mem_end = READ_DWORD_LE(&this->my_pci_cfg_hdr[0x9C]);
}
bank_start = (((ext_mem_start >> bank * 8) & 3) << 30) |
(((mem_start >> bank * 8) & 0xFF) << 20);
bank_end = (((ext_mem_end >> bank * 8) & 3) << 30) |
(((mem_end >> bank * 8) & 0xFF) << 20) | 0xFFFFFUL;
if (bank && bank_start != ram_size)
std::cout << "MPC106 error: RAM not contiguous!" << std::endl;
ram_size += bank_end + 1;
}
}
if (!this->add_ram_region(0, ram_size)) {
std::cout << "MPC106 RAM allocation failed!" << std::endl;
}
}

2
devices/mpc106.h
View File

@ -58,6 +58,8 @@ protected:
//bool pci_register_device(int dev_num, PCIDevice *dev_instance);
bool pci_register_mmio_region(uint32_t start_addr, uint32_t size, PCIDevice *obj);
void setup_ram(void);
private:
uint8_t my_pci_cfg_hdr[256] = {
0x57, 0x10, // vendor ID: Motorola

3
main.cpp
View File

@ -551,8 +551,7 @@ int main(int argc, char **argv)
cout << "Initialize Gossamer hardware...";
MPC106 *mpc106 = new MPC106();
mem_ctrl_instance = mpc106;
if (!mem_ctrl_instance->add_rom_region(0xFFC00000, 0x400000) ||
!mem_ctrl_instance->add_ram_region(0x00000000, 0x800000)) {
if (!mem_ctrl_instance->add_rom_region(0xFFC00000, 0x400000)) {
cout << "failure!\n" << endl;
delete(mem_ctrl_instance);
romFile.close();