mirror of
https://github.com/zephyrproject-rtos/zephyr
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2174501a10
GICR_TYPER is a 64 bit register. On AArch32 when one uses sys_read64(), this results in ldrd instruction. When Zephyr runs as a VM, 'LDRD' instruction on an emulated MMIO region gets trapped to the hypervisor as data abort. Refer the following paragraph from ARM DDI 0487G.b ID072021 :- Section - "ISS encoding for an exception from a Data Abort", "For other faults reported in ESR_EL2, ISV is 0 except for the following stage 2 aborts: AArch32 instructions where the instruction: — Is an LDR, LDA, LDRT, LDRSH, LDRSHT, LDRH, LDAH, LDRHT, LDRSB, LDRSBT, LDRB, LDAB, LDRBT, STR, STL, STRT, STRH, STLH, STRHT, STRB, STLB, or STRBT instruction." As 'LDRD' is not in the list, so ISV==0. This implies that Arm could not decode the instruction for the hypervisor (in EL2) to execute it. Thus, we have abstracted this read into arm_gic_get_typer(). For AArch64, we use sys_read64() as before. For AArch32, we use sys_read32() twice to read the lower and upper 32 bits of GICR_TYPER. Thus, we ensure that when the access is trapped for AArch32, Arm generates a valid ISS so that hypervisor can execute it. Signed-off-by: Ayan Kumar Halder <ayankuma@amd.com> |
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| .. | ||
| adc | ||
| audio | ||
| bbram | ||
| bluetooth | ||
| cache | ||
| can | ||
| clock_control | ||
| console | ||
| coredump | ||
| counter | ||
| crypto | ||
| dac | ||
| dai | ||
| debug | ||
| disk | ||
| display | ||
| dma | ||
| ec_host_cmd_periph | ||
| edac | ||
| eeprom | ||
| entropy | ||
| espi | ||
| ethernet | ||
| flash | ||
| fpga | ||
| gpio | ||
| hwinfo | ||
| i2c | ||
| i2s | ||
| i3c | ||
| ieee802154 | ||
| interrupt_controller | ||
| ipm | ||
| kscan | ||
| led | ||
| led_strip | ||
| lora | ||
| mbox | ||
| mdio | ||
| memc | ||
| mipi_dsi | ||
| misc | ||
| mm | ||
| modem | ||
| net | ||
| neural_net | ||
| pcie | ||
| peci | ||
| pinctrl | ||
| pinmux | ||
| pm_cpu_ops | ||
| power_domain | ||
| ps2 | ||
| ptp_clock | ||
| pwm | ||
| regulator | ||
| reset | ||
| sdhc | ||
| sensor | ||
| serial | ||
| spi | ||
| syscon | ||
| timer | ||
| usb | ||
| usb_c | ||
| video | ||
| virtualization | ||
| w1 | ||
| watchdog | ||
| wifi | ||
| xen | ||
| CMakeLists.txt | ||
| Kconfig | ||